What makes GT and Forza racing sims, what disqualifies GRID from being one?

[dtewi]

ultima said:

psrock said:
I still think Mario Kart Wii is the best racing Sim I have never played. Grid is second on that list.

WTF?

What other game uses a WHEEL in a racing game? I mean.. a WHEEL. I nearly crapped my pants when I saw it.