They are used literally in all 3 Zerg matchups and we just saw on GSL RagnaroK defeating a superior player like Maru with Muta build.
Just tired of seeing Diamond Zergs on these forums complaining Mutas are weak and fishing for buffs wanting to amove their Mutas into straight armies like they do with the Banelings.
That was maru playing arrogantly lol, which he often does
You saw g3, when maru started playing normally, the mutas were complete garbo
Zerg: is relegated to HotS strategies that were heavilly nerfed to the point they were abandoned but now that everything else has been nerfed are the next best option.
TCF: 
Mutas have never been bad. Zerg just has had a lot of options so its hard for them to pick and choose.
in brood war you could morph the mutalisk into a aa unit or ag unit. zerg evolves and it’s part of the identity, you know. why this feature was removed is beyond me, it’s like removing carriers from protoss or battlecrusers from terran, or removing stim from marines. cause mass mutalisk is not hard to counter with phonixes/archons and thors/liberators/marines/widows. if you mass mutalisk and ther enemy has the counter, well your dead cause the mutalisk can’t morph into anything usefull
Be happy that the forums zergs don’t balance the game cos if they do. Zerg would win 90+% of premiers and BatZ would probably still spit out propaganda that somehow Zerg is weak. I’m glad that Blizzard does not listen to them and they shouldn’t. Right now Zerg is not OP. I mean its still a good race but its not going to win everything anymore.
As far as i can see TvZ is in an amazing spot and its competitive from both sides. ZvP on the other hand is still flat out Zerg favored. I mean Serral on the PiG show has said that lategame ZvP is Zerg favored. Who should listen to ? Diamond Zergs whining that their race got nerfed after absolute domination in the latter half of 2019 or Serral ?
Btw With all the Zerg nerfs I think Serral, Dark and Rogue is going to be completely fine, I’m not worried about them at all. Those 3 don’t become the best due to favorable balance. Other Zergs I’m afraid are going to dip. Oh Credit where credit is due RagnaroK is actually really good. His ZvT i think is better than most Eu Zergs’ ZvT. Better than Elazer and maybe slightly better than Reynor’s.
Not gonna lie Zest going down 0-4 hurt my toss heart a little.
Mutas: had a negative win-rate in WCS fall.
Terran Cry Force: Mutas have NEVER been bad!
Go get your head checked by a psychologist already. This amount of bias isn’t healthy, especially over something as dumb as a video game.
Batz: a Zerg should have a 50% win-rate vs an equally skilled opponent.
Lune: BATZ WANTS ZERG TO HAVE A 90% WIN-RATE.
This is what “Batz-Derangement-Syndrome” looks like, Ladies and Gentlemen. People are so intolerant of anything batz says that their brains completely shut off when they read his posts.
LOL
The guy who made a DT shrine and then didn’t make DTs, even though the Zerg had no detection, was supposed to win that game? If you are going to pick examples of why zerg is OP, you need to pick ones where the Protoss doesn’t play like trash.
Roaches are also used, doesn’t mean they don’t suck. Hydras were actually before but now that they got nerfed you have to use something
Mutas have always been trashed in LOTV. The simple fact that the larvas got -25% nerf has made them not really viable like they were in HOTS.
You can’t simply go lings/bane/mutas without dying on an attack. Look at the last Ragnarok vs Maru, he made spire, and don’t have enough to hold the ground, instant gg.
After, if you manage to go ahead you can eventually go mutas, because they’re still good to snowball, and kill medivac, and allow Zerg to be more agressive than Hydras.
Before they weren’t played at all, because Terran had heavy hard counters for them. So you see them more often, but they’re still way to expensive for what they do (and despite the larvas nerf that broke Zerg eco, they didn’t received any buffs to compensate).
GSL: Looks like it’s gonna have 4 Terran players in RO4.
Zerg: wins a map
Terran whiners: Better nerf Mutas 
Genius move, really. When Zerg is at it’s weakest you double down and complain the race is too strong. Blizzard will never see it coming and they’ll have no choice but to buff Terran!
Oh now tournament representation matters? Ok what about stay at homestory Cup? What about wcs global finals? What about wcs fall? Then its just about zerg being way better.
But if 1 tourny doesnt have a very high zerg representation its clearly because of Balance and zerg is bad 
You whiny guys never fail to amaze me.
That’s because the Broodlord/Corruptor combo was too strong back then to be able to appear out of nowhere in any part of the map. Just one Broodlord has the ability to wipe out any base if it is not taken care of. This is why they has to be Hatch from a Hatchery.
In BW, a lot of things are different. You can’t compare the two game together when it come to balance.
Are You really suggesting that roaches suck? are You for real right now ? Why do they suck. Let me guess because i know You are being You right now. They are too hard to use?
While its true that it doesnt mean only because You Build certain units they cant be too weak but mutas are involved in a playstyle. You especially chose to Play Them.
You can easily tell that mass phoenix or voids are utterly garbage vs zerg because guess what? They arent used at all in a playstyle.
But hey yeah lets complain about a playstyle that wins a Good amount of games in every matchup.
Gotta love it when whiny Tosses use the most casual tournament of the year and tournaments from old patches to justify their tears. It’s pathetic and funny at the same time.
Still better than picking 1 tourny to whine on Plus still screeching mutas are Bad while Pros using and winning with it 
And i didnt use past tournies as an evidence for the current Situation. I compared the zerg behaviour in the past with how they behave now. When zerg dominates=better Players. When there are less than 3 zergs in ro8= zerg being utterly underpowered.
That is the point of the counter. You are saying that zerg units shouldn’t have counters since they should just be able to morph into a unit that can counter the counter.
Oddly, when Zerg is at their “weakest,” they’re still at or significant;y above 50% win rate in TVZ and PVZ respectively. I’m so terribly sorry that your players might actually have to look at the screen to win a GSL this year.
What nerfs to mutas are you talking about?
unless im wrong the only change to affect mutas where thors now do LESS aoe splash making it even weaker against mutas for tvz.
The reason mutas where never played for a long time in lotv was because hydras where too good so noone bothered making other compositions outside ling bane hydra.
Now as hydras got nerfed zerg are using so many different compositions in all their matchups (outside maybe zvz being a little rvr heavy) that its looking like zergs have more choices than any other race in mid game comps.