You were doing it wrong. The Library can be fun if you play it right...slugging through enemies is not how you do it bre; jump off the walls and dash on past leaving grenades behind you. Awww yeah...:cool:
Honestly, the only suckass level was Two Betrayals...it was long, a pain in the ass for situations, and was an exact rehash of Assault on the Control Room, except at the end you fly up instead of going back to the underground catacombs.