KF is the only faction that got a good exo. Everything else is trash. Poor KF players are easily defeating LLs in all other factions.
I haven't seen all the exos in play yet, but I'll comment on what I have. I've been playing Lonx and Hammerfall is ridiculous with Spur. I threw 2 Purgers into my IS Meta BG and I gotta say, I like em. I wouldn't say they're OP, but they're not bad. Probably better in Strux. UD one is annoying as Firk considering it's 8 speed and poops out little minions of itself.