Come on man, he's had quite a few really impressive moments. He averaged almost 9 yds per carry as a rookie and almost 6 yds per carry in 2009. He also had nearly 150 yds rushing the playoff win vs Philly.
Nothing as awesome as today, but he has had some really good moments and has flashed alot of skill.
I've still never been impressed with him. Other than speed he doesn't have much else and he's really injury prone.