-AoSth is seen as a meme machine and is looking fondly due to its quirkyness.Yeah, Sonic basically has been fairly lucky with adaptations. When the worst piece of non-gaming media to feature your character is a one season bit of meh like Sonic Underground, you're not doing too bad.
-Satam is seen as an example that Sonic can have more serious stories while also being fun.
-When Chris and his OC friends aren't hogging the spotlight, Sonic X is the closest that we get to Adventure-era Sonic stories and is decent and it brought us Mike Pollock.
-Sonic Boom's Cartoon is seen as the only good thing to come out of the Boom Brand.
-The OVA. Need i say more?
There's also the Archie Comics and IDW comics, which despite the ****storm happening with the former, are still seen fondly in many Sonic circles.
Sonic's Film also has celebrities, but it uses them more wisely.It's amazing to me that given the contrasts in consistency for their respective franchises that Sonic ended up getting a film that was fairly restrained and low-key respectful to the character while Mario is getting the celebrity filled fluff from the people that did the Minions movies.
Jim Carrey's Eggman is a character that only could be fully realized by Carrey's Live performance, his body language and mannerism that characterize his career are used fully in his Robotnik interpretation. He was clearly chosen partially due to his recognizable name, but in the context of the movie he can fully use his expertise to give Robotnik life.