To be more specific, which of these isn't being handled properly/ with enough respect by Sega? Which one do you really care about the most?
I personally think Greendog: The Beached Surfer Dude! should have at least been on a hundred different Genesis collections. I was going to add Matt Rorie's Alpha Protocol but apparently Sega WILL NOT publish any sequels.
Also ignoring licensed stuff like Aliens. None of the Atlus stuff.