We can get even more out of the 360, says Forza 4 dev

[Luminis]

Its relative really. Someone who doesnt like the 5th game in more than one series, can all it a curse. There is a little truth to it in that quite a few 5th titles have not been as well recieved as other. Halo and GT5 are good examples.

I think it's just a general problem that most developers face. A succesful franchise will create a lot of expectation. And if the developer runs out of fresh ideas, which is not uncommen after a few incarnations of a game, you get what we've seen with GT5. Or a lot of other franchises that had that happen on different sequels...