1. Karlito being a bit small, and having the wrong sounds.

2. Most or some mutants forcing the player to stop, when its holding a specific NPC.
(like the Izlom/Fracture for an example)

3. Most or some NPCs have a tendancy of putting affects on the player, while the mutant attacks a specific NPC. (like the controller having quite the annoying, ringing sounds when it defends itself. Or one of the Dark Stalkers putting this visual screen affect, when it attacks a NPC.)

4. A bit of lag here and there, but thats my end.

Yeah, I'd say there is a bit of bugs but, I understand the addon was released days ago, not too long. I also apologies if, these iterations don't sound right, but I hope I made myself clear.