I know that this is a really old topic by now and Kitty is doing some great things in Wolverine and the X-Men as well as in All New X-Men, but I just found this topic and wanted to point something out. I'm probably defensive because she's my absolute favorite character. I have heard the complaint that she is way overpowered for a long time and that her "overpoweredness" makes it impossible to keep the focus on her for too long. That seems about right, unfortunately. That's why they can never keep that Superman guy in print.
Oh, that's too bad. I'm sure it's fine that Kitty is all "ninja-y and super-awesome" but it sounds like a lot of flash with little substance.
I think I know that character. His name was Gambit.
Oh, that's my other favorite character.