I am having a blast! I took the bait and went gladiator retaliation and it is extremely powerful. Haven't bought a single piece of equipment yet and can blast through yellow maps. I am using two retaliation skills in parallel and that makes for a fun combo play style.
I like all the league stuff, the encounters have a cool feel to them and especially the beyond themed camps with their buff afterwards are fun. I also really enjoyed the small changes they made to the campaign although I'm sure I missed quite a few.