To start this of with, i love legion, best thing ever to happen to wow, but this is... wow.
Sewers:
Respawn timer - up to 2 mins - in a heavy pvp zone, with huge amount of players, elite mobs that oneshots you and much more.
With that said - When a elite mob spawn, you hit it - ofcourse, to get the loot it drops, but there will be 7000 other players doing aoe, and u cannot survive, at this point you've been dead 700 times, so you got 2 mins respawn time, and it's dead before you revive - no loot.
This makes the only way to do it proper to go with a raid group, which ruins the fun of FFA pvp.
Not to mention that some of the bosses has huge aoe abilities with some graphics, not even wild that makes the place so laggy it's unbeliveable.
I got lots more of theese kind of "What the hell..." but i'll leave it with that .. to me it seems like sewers wasn't tested at all. Nothing makes sense, i cannot see how they really though that theese methods was good ideas.
Don't get me wrong, the idea of the sewers is good, but the method and execution is just.. WOW really? You can't be that dumb.