He did some good games, like BCMG and UC, although not enjoyable to everybody...
No one ever saw a game he made that wasn't a jake of all trades, so it might be either pretty good, or terrible... and I doubt he would be making FS3 any time soon, seeing that he has got 2!! games that are still in development... and he asked what if, so I don't see much concerns here... unless he buys the rights.
The thing I think we should be most scared of is the story... how is anyone going to capture that feeling about the first time you see the Lucifer ingame? Or the first seconds of Into the Lion's Den?
Yeah, you have a reason to be afraid of...