I dunno, I think Sonic Adventure was good at the time. It had many obvious problems like falling off of ledges too easily, crummy cameras, the extremely stilted and childish dialogue, Big the Cat, Knuckles' levels, etc. but it still had a lot of gameplay and heart. The XBLA version should have been updated with widescreen support, but otherwise it's a good port. However, I don't see people who don't have nostalgia for the original enjoying it very much due to the aforementioned problems.