Thomas Biskup worked on Ancient Domains of Mystery alone from 1994 to 2002. It's one of my favorite games. But that's a PC game.
If you take too long making a console game, you have to change the platform you're developing for every few years, and you're left with a horrible game that looks like it was being ported more than designed. I can think of a certain game that started on the GameCube before moving to the XBox and then the 360.












