The creator of Sonic said that Eggman is his nickname, while Robotnik is his real name. He is also known as Eggman in Japan, just like Princess Toadstool is also known as Peach in Japan.
Adventures of Sonic the Hedgehog: Pretty crappy, because of Robotnik's/Eggman's beehived face, wacky robots, and it never entertained me very much. Eventhough it became a YTMND fad, I still dislike it.
Sonic the Hedgehog (ABC): Why would Sonic have three girlfriends: Amy Rose, that robotic rabbit, and Sally? Also, some of these characters look like they are from Rocket Knight Adventure. And that purple midget is a boring character, IMO.
Sonic Underground: Never watched it, and I never will.
Sonic Anime Movie: Half as good as the Japanese Sonic X, and why would it have an owl, a president with his daughter, and Knuckles wearing a cowboy hat and a pair of shades?
4Kids-edited Sonic X: It made me feel bad, because 4Kids made many people hate it.
Original Japanese Sonic X: This is the best animated Sonic show I've ever watched, because of the music, more accurate storyline than the other shows, very good voice acting, and a better looks. It makes me feel kinda bad to hear people say "OMG, Christopher Thorndyke and his family and friends all suck!" I understand he is annoying, but would you want Sonic to drown?