In fairness, there's plenty to dislike about SA1/2 and Black Knight. The Knuckles/Rouge levels, Big, motion controls, and let's face it, some painfully bad writing not helped by VAs often only getting 1 take for each line and no context around said line.
Sonic in general continues to have a spotty track record where even when Sega has a few good ones, a bad one soon follows (Shadow, 06, Boom, Forces. Arguably Lost World or 3D Blast). Even Frontiers and Superstars had mixed receptions. It's a series that only rarely has all of its act together. Which definitely sours people on it.
That said, shitting on the Genesis trilogy is a bridge too far and Arin's just a lousy gamer overall (is reading on screen tutorials really that damn difficult?!) so of course it tracks that he has bad hot takes.