Easier to capture, more fun to fight in, don't need to walk for 2 minutes to get into a fight, either simplify containment sites or replace them with something else.
There's more wrong with the current Esamir than just the containment sites. I'm going to shamelessly self promote here and ask for input on this: https://forums.daybreakgames.com/ps2/index.php?threads/more-work-on-esamir.258117/ I do so because I actually think that would be better than what we currently have.
Agree - If I wanted to play Doom 3 I would play Doom 3. I always avoid these fights. Takes 20 minutes to find how to even get out of the damn things....