What are things that annoy you about matches??
Me personally, something that really frustrates me is when the rest of the team keeps going in the same path every time they respawn, instead of going around. There’s more than one way to get the objective, you don’t have to keep going the same way.
Teammates who refuse to take or occupy space and then blame me for not throwing the game by being as passive as they are. It’s pretty annoying and backwards.
Tanks that push without creating space
Tanks that create space and then don’t push
Dps that push before space is created/don’t help create space
Dps that don’t utilize space that’s been created
Supports that don’t help stabilize space (that Ashe holding the high ground first point at Havana? She’s key and the moment she stops putting on pressure the team can just walk, stop ignoring her for “not being with the tank”)
Supports that don’t think they can throw just as easily if not easier than the rest of the team
Every single player who uses the scoreboard in any way shape or form to justify or criticize anything
When someone plays a character they CLEARLY have no practice in, or are in denial about their inability to play them. Sure sure, they could have “had a bad game”, but if someone goes 2-13 in a match and did only like 1.2k damage…I am just going to assume they had zero business playing that character to begin with XD
95% of people can’t play snipers, or heavily niche characters like Illari very well…it’s okay…there are tons of other great characters to play! Use them.
I guess in Stadium, teammates aren’t always good at keeping an eye out for troublemaker opponents, and marking them on the screen.
The good Meis, Cassidys, and so forth.
If left unchecked, they’ll blow your team’s spot in seconds and take control of the point. It’s preventable, but comes down to communication and awareness.
Soldier.
Not communicating
And I don’t mean talking to me. Believe me, I wouldn’t want to talk to an Overwatch player either, but the least you can do is utilize your damn ping button.
Way, way too many players will yap in chat about there being someone behind or there being someone out of position that should of died but they always say it after the fact when it’s completely irrelevant.
Please learn how to use your ping button. 
‘Packet loss’ whenever any q is pressed.
People that counter swap to destroy me when I play Hazard, forcing me to go Immortal Horsie or Russian Laser Bubble.
Throwers. Whether I’m playing widow or mercy I can’t stand players that suddenly give up. Why should I work so hard if you don’t want to win. Why am I here? 
Hero bans are the worst
“It’s just Quick Play,” as an excuse to not play the game as intended
I hate Widow and Sombra with a passion, when people don’t ping the Widow,in fact people who don’t ping the enemy. What are you even doing?
Teammates who have the diplomatic skills of a mongoose but still feel like their opinion on every matter needs to be stated.
You’ll have a perfectly surmountable challenge on your team–a few bad plays, perhaps, or a teammate having a bad day, maybe the teamcomp isn’t optimal–and some idiot will decide the best solution is to tilt everybody and start an argument. Gee thanks.
#1. Really disorganized teams. The worst! 
#2. Tanks that try to fight an enemy team solo. Noooooooo!
#3. A friendly Lifeweaver who life-grips me right when Im tryin to attack or right as Im using my Ult.
#4. Teammates that panic during low-health situations who make healing them very difficult.
#5. Teammates who repeat voicelines, over and over.
#6. Unwinable stomp matches.
NPCs who get farmed by cheaters and can’t even leave spawn yet defend the cheaters that are farming them like their life depends on it.
well i been playing moira a bit today and i am starting to notice the “dps difference” now or the passive. i cant carry games as much as i use too as moira if my dps are performing badly
i was wondering since yesterday i won a lot “playing” dps.
i wonder if it really is dps difference this season?
also … this mei made me mad today…
Teammates that don’t realize they are being flanked and pretend said enemy flank doesn’t exist.
People saying “iT’S jUSt QuiCkpLAY” when I’m anything less than elated when our team gets stomped. I don’t expect things to be taken 100% seriously, but at least try damaging the enemy gamers.
Meis with bad aim.
People who don’t push forward & stay back. And then get upest when we can’t capture the point because I CAN’T TAKE IT BY MYSELF WITH YOUR STICK POKING. HELP. ME.
Hammonds who only know ball is life.
Not having more than 4 sprays/emotes/voicelines at a time.