Monsters that you're forced to kill, more like. It's almost impossible to stealth your way past them.
. It takes longer to kill them than sneaking or dodging past them, imo. But it's reallt not much more crowded than any other mission, since there is quite a lot of space to maneuver around in.
Life of the party is great. But bonehoard is best!
Also another excellent level is the submarine mission from medal of honor allied assault