I haven't seen any of the others (I've been given general impressions of SATAM and Adventures of Sonic the Hedgehog), but holy Christ does Sonic X ever piss me off. It isn't even about Sonic, it's about that whiney piece of s**t Chris Thorndyke, and when it's not focusing on him, it's focusing on one of the other 6 zillion characters the creators made.
Sonic and pals get absolutely no credit unless Chris or one of the non-canon characters did something. Sonic could run a marathon and he'd only get 10% of the credit, whereas the rest would go to Thorndyke because he was there or something. When Super Sonic and Super Shadow saved the earth from the Biolizard's attempted colony impact, Chris was given more credit than either of them.
At least the Metarex were kind of sort of cool.
The Adventures of Sonic the Hedgehog was most definitely a kids show, what with it's wacky over-the-top slapstick comedy and general annoyingness. I mean, hell, blue boy was voiced by STEVE URKEL (played by Jaleel White). I haven't seen it though, so I can't really give an opinion on it or the other three.
...I'm also not sure why I got so worked up over this.