Towers are ****ed up in general:

Castle:
-Defenders respawn next to flag while attackers spawn outside. Even guilds with low members can defend easily like that.

Mod:
-Bottleneck in center. Most of the time you get up with .5 health because you stand around slashing on the stairs which is no fun.

Snowtown
-Like castle, defenders spawn too close to flag for the tower to be difficult.

Deadwood
-Bottleneck on stairs, a guild can send defenders to stairs and no one can get by.
-Cluster**** in flag room, no room to move in flag room so you juat slash until the flag goes down. No skill needed.