Everything post-Croc was just not all that great. Most of the last battles being nothing but titan/thug battles was annoying; I'm just not a fan of the fighting system in the game. More than anything else, I kept finding the basic thugs to be the biggest problems, not the bosses/titans themselves. This one particular titan/thug battle right before Poison Ivy drove me nuts and I didn't play the game for over a week. I finally went back to the game tonight and cleared that part...that was probably the highlight of the game for me.
Maybe I'm just a glutton for punishment, but I also did the optional fight against the 20 "party" thugs before the Joker stuff, but after that previous battle, it felt like a snap. The Joker stuff essentially just being several rounds of titan/thug battles was a let down, and the ending was a big nothing.