One that comes to mind if Mario. For the majority of the series, main Mario games ranged from excellent to amazing when making transitions into new generations. Mario Bros to Super Mario World, to Mario 64, then Sunshine, Galaxy, and finally Odyssey. Most of these were excellent titles that built and surpassed previous titles, which is crazy to think since each new Mario game seemed more amazing than the last, and Mario 64 in particular could be argued set the standard for 3D games to follow... Well, thoughts are mixed for Sunshine, and Wii U lacked a sort of core 3D Mario game. I liked Sunshine though personally.
As for an example for a bad one... Well, I heard Castlevania's move to 3D was a trainwreck, the N64 titles that is...
Dance my pretties!
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