He would strike you more as the guy down the street with a garage band than a rock star.
That's the reason I think he has been so transcendent and successful. Obviously the FF make great music, but Grohl's earnest "regular guy" vibe makes him very likable, respectable and relatable. Lots of bands make good music. It's the bands who fans connect with that really go to the next level, and Dave is either brilliant about that or he's just the exact right personality. Maybe both.
This whole broken leg thing has cemented his position in rock star legend. A full break AND probably more painfully, a dislocated ankle. And the dude didn't show any pain, joked with the crowd and finished the show - and then refused to cancel any more shows than the time it took to make him a killer guitar throne with "lasers and ****"
Not many cats would've done that. Or could've.