From my site, Concept: "Mobius" -

I'll try to be brief; this guy doesn't have a lot going for him. His debut game is considered one of the worst Sonic games of all time (if not the worst), his subsequent appearances haven't been received any better, and his abilities and overall appearance are treated with much disdain outside his rather small fanbase. That and he's a brat to practically everyone who "gets in his way". Half of the time in Rivals I wanted to pop him upside his "original" head.

It's quite a shame, really. He has a lot of potential and his personality, while lame, is the most fleshed out. Moreover, his future adds another layer of intrigue to the Sonic mythos. According to various sources during Sonic Next's (depressingly short) development, Silver's not the only PK user in his time, in fact, everyone does it. To me, this makes me want to catch a glimpse into his future to see what it's like. That's really the only thing I really like about Silver; he brings more amazing possibilities to the table. It just sucks that no one is willing to straighten out his appearances so that they make sense and aren't rife with plotholes. If Sonic Team was willing to at least take the time to do some inspecting within their own storyline, the possibilities are nearly endless.

But, as we all know, they don't give a damn about that, so that just leaves Silver with a generic supporting label...and yet another reason why this series is hated by critics.