Oh I dunno. I'd say it's a solid three-and-a-half-star movie. I remember laughing pretty much through the whole thing. Watched it hungover though and that makes anything funny.
Also: Jenna Fischer is Pam! Wow! Also I Google Image Searched her and like the third picture totally featured her naked butt! Awesome!
"Walk Hard" is the kinda movie you only watch once, but will re-watch funny scenes from. It was good but stretched a bit long.
On the other hand, it set a record for amount of screen time showing penises in an R rated movie. It has scenes where there's (flaccid) dicks hanging out all over, which makes for a good movie surprise.