There are some great ideas here, but they don't go far enough. There's too many ATs. Why do we need so many melee ATs? Get rid of tankers, brutes and stalkers. They're basically all the same anyway. There's too much ranged, as well. Get rid of sentinel completely and nerf defender and corruptor damage modifiers. For that matter, defenders are too effective at buffing the party, and they're able to spam buffs too often. Nobody wants AM or FS on them all the time, it's annoying. Reduce that, increase recharge times, and add an HP cost to use any of their powers. The only AT that should be doing any observable ranged damage is Blasters. But nerf them too, they're OP enough already. Rework their secondaries and remove all powers that have any effects aside from damaging the enemy. Also, MMs should only be able to summon one type of pet at a time. Having 3 types of pets out at once is OP and not fair to players who don't have pets. Leave Controllers and Doms alone, those guys have it hard enough as it is.
All villain groups should be given an equivalent to sappers, and every enemy group should have at least one. If end drain annoys you, either get better, fix your build, or go play something else.
And, further to Hagis' suggestion above, can we all agree that we should just get rid of all door missions? Nobody likes them anyway. Instanced content is bullshit, it goes against the tone of the game, and it's been a plague on CoX since the very beginning. Actually, maybe let's leave in a couple, but only door missions that use the large cave maps and require 3 or 4 clickies to finish.
