Out of the melee you listed only DH are flashy.
Rogue and Druid have a huge kit, but if you’re looking at m+ and you think DH is overly simplistic, then you’ll be surprised to find that the top performing rogue spec in m+ is sub and it is literally 2 buttons.
However, if you are more focused on fun, then outlaw is where it’s at; but in contrast to sub’s 2 buttons, outlaw is all the buttons, all the time, all at once. Somehow, neither of those are exaggerations lmao.
The outlaw rotation has some priority logic to it if you get into it, but basically you keep pretty much everything on cooldown all the time:
SS, Dispatch, Pistol Shot, Ghostly Strike, Blade Flurry, Between the Eyes, Echoing Reprimand, Marked for Death, Adrenaline Rush, Slice and Dice, Roll the Bones, Vanish, Killing Spree.
You might be thinking, “yeah but some of those are like 1-3 min CD’s!” Technically yes. However, our legendary is invigorating shadowdust which reduces all your ability CD’s by 20 secs when you vanish and our passive Restless Blades reduces certain ability CD’s by 1 sec for each CP spent, and Echoing Repreimand anima-charges 4 cp’s to count as if they are a 7-point finisher (aka 28 seconds of cooldown by popping off 4 finishers with those anima-charged points).
So what it looks like in practice is your abilities are constantly coming off CD along with other plate spinning so you’re balancing what to press against all sorts of other windows. GS lasts for 10 seconds. KS is a 2sec ability, Blade Flurry lasts 12 seconds, RTB lasts 36 seconds. Free RTB buffs from Count the Odds conduit last 5 seconds or 10 seconds if activated from stealth, Slice n Dice lasts about 40 seconds unless you end up rolling attack speed buff a few times and it can end up having like 10 minutes of time on it or if you don’t roll that buff you’ll have to recast it every pull. MfD already resets on enemy death, but it will also be resetting in about 30sec (less if you have vanish).
You have to play it to see if you like it. I think it’s a ton of fun, probably the most fun I’ve had on any spec in all of WoW history. But you’ll do all that and do way less dps than sub or a warlock pressing rain of fire. Oh and people still will expect you to kick, blind, gouge, kidney shot, and use your defensives.