I liked Clone Wars, and Metal Arms. Those aren't even Xbox Only games, and I'm not positive to which game you're referring to but I don't think Godzilla is exclusive to the Xbox either.
Wrath Unleashed?? I heart that game... at least... the xbox mag demo was pretty cool, you got to like... be chess monsters.. and stuff... and.... uh..... okay, it was pretty sad... but i played it alot.
Don't be sorry, its just that the Xbox has enough exclusive flops on it, you don't need to list all the multi-console flops for it too. We had a "worst games you ever played" thread in the General Discussion forum awhile back. You can check that if you really want to see some bad games.
Uhm, if this is "saddest" games, please edit the title, at first I read it as "sadists" lol... Maybe if you force yourself to play sucky games then you are a bit of a sadist then...?