So. I don't wanna be kinda that guy who ruins stuff, but there's something that needs to be done here.
I think two maps should be removed:
arena_grid_walls and arena_wow
The reason for that is that these maps are too closed (or too small). RED players always get the upper hand, as they can fire everywhere and still hit the boss, and for closed space, they keep using knockback a lot. This is why I've rarely seen any boss win in these two maps. Another thing, is that these maps become OP for bosses with a rage that is devastating in close ranges (eg. Seeman), and that may make people overuse these bosses. I'm not the only one that thinks these maps should be removed, some people agree with me as well. So if you could do something about, I'd really appreciate it

So you're saying that the Red team always gets the upper hand and that you rarely see bosses win on those maps, but that bosses often win those maps.

Means.

88% (balanced hales) bosses lose in these maps
12% (hales like seeman, crash) wins in these maps

I would say these maps are unbalanced among hales.
Well Grid Walls is much worse because you can jump spam in wow if you have effort in superjumping.
Grid Walls are indoors with automatic opening doors, and small areas of reking Heavies and Medics.

ah yes some have described the feeling as being raped while playing on gridwalls i think

That's quite enough of that, Llazarus.

There´s nothing intresting about these two maps, Quick rounds,boring to play,bosses dies to quick, dmg farming, red team camping next to spawn, and so on.

I agree also, it does deserve to be removed.

Supporting.

How about C17 prison? its small and reminds me of WoW quite a bit