I'm enjoying Paper Mario. It's fun. I still don't like it as much as TTYD, but I have a feeling that perhaps if I'd played Paper Mario before TTYD, I'd like it better. A lot of levels and partners are very similar. The boo mansion makes me think of Creepy Steeple, only I like Creepy Steeple better. And I like Bow a lot and she's certainly my favorite partner in Paper Mario, but Vivian is cooler. Vivian is just the best ever.
Regardless, I have enjoyed the boss battles, but I find it to be sort of the opposite of TTYD in that I have a much more obnoxious time dealing with stupid enemies than bosses. In TTYD, you just want the boss to die, and in Paper Mario, you beat a boss and you're like "That's it?" I mean, Lava piranha wasn't hard, but I was surprised when it came back a second time and I had to beat it up again. Not hard, just surprising.