I kinda want to say Guerrilla Games. After I found out Killzone 2 had single player I thought the first half of it was boring but the second half was great.
I doubt they will create a new IP though I think they will make a Killzone 3 before they do something else.
I just played through Fallout 3 for the first time a few weeks ago. I didn't see a whole lot of glitches with it although I have heard about many of them. So I don't really see what all the fuss is about.
I'm happy to hear they are bringing back the voice actors from the old cartoon. Even if it is a bad game if it has a decent story with all those villains it will be enough for me to play through it.