I have two major problems with the bosses in the game. 1. The bosses have two much health points. While I am not saying they are too hard to kill I am saying it takes to long to kill. Some of the boss battles seem like nothing more then unload twenty clips in him shoot it with five rockets and then its at half health. Reduce the health of the bosses to make the fights seem less monotonous. 2. This may sound like a contradiction to the first comment but make them harder to kill. All of the bosses are the same fight, shoot boss kill adds as they spawn rinse and repeat for ten minutes. My suggestion is give the boss more devastating abilities and give players stuff they have to encounter and dodge. Rather then bosses just shooting the same weapon when they target you give them abilities to complete purge a section of the arena that requires players to be on their feet and know where to be to prevent dying. For example Progoth can have an ability that every minute he incinerates the floor of the arena forcing the players to take cover on the raised sections of the arena to prevent dying. With these changes it will make the bosses more challenging and they will not seem so monotonous.