I loved the first one. The second one lacked good boss fights, and had an extremely weird bonus system. I can't solidly remember any of the games after that. I can only remember the two crappy final battles in the next two Crash games I played, and the horrid loading times in one of them.

Never really played that new one with the teaming up of Crash and Cortex. I'll try it some day though, because I find the Crash series to be pretty damn fun. Still not as good as the Banjo-Kazooie series, which is platform heaven.