I don't understand why people keep declaring this.
I know It plagues many online rooms, and it's entirely fictional with arguably un-achievable performance capabilities giving it a clear advantage over anything else, but I have probably driven 200-300 cars on GT5 that are less fun/more dull/worse than the X2010.
I could also list 200-300 I would rather drive however, but I just see it as a bit of fun.
On topic, I think it would be great to have an X2010 seasonal event, as like the Ferarri F1 event, it would give it a real purpose in the game other than being a grinding tool.👍