@TruthEnigma - several of those are not SEGA games, they're only running on SEGA hardware. South Park Rally wasn't even developed for a SEGA console, it's a port.
My apologies. Try this.
Master System: Alex Kidd in High Tech World
Miracle World is great and Shinobi World is awesome, but this doesn't look or feel like an Alex Kidd game. I understand is started life as another game, but so did Mario 2 and it's still fun. Maybe it's too much of a departure from the Alex Kidd formula, but I hate this game.
Mega Drive: Super Thunder Blade
The Megadrive had kind of a crappy launch, with a couple of notable exceptions. The worst of which is Super Thunder Blade. The arcade title is fantastic, but this port is awful. What's really amazing is that Sega keeps putting it on compilations. Why for the love of all that is good? It sucks.
Mega CD: Entire Make My Video series
Why does this exist? They're not really games and even at the time I could not have cared less about C&C Music Factory, Kriss Kross or Marky Mark.
32x: Slam City with Scottie Pippen
The 32x had this along with NBA Jam Tournament Edition. NBA Jam is a classic. This is near unplayable. Who though this was a good idea?
Saturn: Sonic R
The controls are so poor and the pacing is slow. Perhaps they could have developed a 3D exploration game, but as a racing game, it sucks.
Dreamcast: Sonic Shuffle
I hate Mario Party and this is a poor clone of a game I hate. Not a good recipe.
As a 3rd Party: Sonic 06
Two problems exist with this game. The first is the game is broken. It's so bugged it drove me insane at a number of parts. The thing is that if it had been finished properly, the story is stupid. I have no interest in a love story between a woman and an anthropomorphised hedgehog.