I haven't recieved my 2011 yet, but I did a long test drive of a 2010. I agree that in normal drive mode it basically feels like the 4.8i (probably a bit faster than that obviously). In M-mode with transmission in sport, it's a different beast though. I don't mind it being "slow" in regular drive mode because on the highway and cruising around you sometimes want better fuel economy than power...at least I do.

If you want the feeling of really moving fast though, a light weight car that's low to the ground is what gives the most. Not a 5k pound SUV! Like the post above me says, just look down at your speedo if you don't think you are moving fast and be prepared to be surprised!