but it also has NOTHING to do with simply "the rock" or else "the rock" would be the new Will Smith in hollywood.. and he's not.
His performance was praised almost universally by critics though
"[Johnson's] skin looks as though it's been slathered in butter; his enjoyment is infectious and keeps the movie speeding along" New Yorker
The Los Angeles Times felt that scenes shared by Diesel and Johnson were the "best moments"
Not all reviews were positive however, with Film 4 criticizing both the film's long running time and its treatment of female characters, remarking "[Females] cameo strikingly in buttock form. Others actually have first names," but
praised Johnson's role as DSS agent Luke Hobbs, saying he "provides a more credible anti-antagonist to our anti-heroes than the straight up villains can manage".
Variety focused on the roles of Johnson and Diesel, lamenting the lack of "brawny" leading men of the 1980s or the "manly men" of the 1950s and 1960s and calling their pairing "a welcome injection of tough-guy vigor" and commented that, based on Fast Five, a "sixth entry could be something worth waiting for"
Empire also heaped praise on Johnson saying "How to re-ignite an ageing franchise? Drop [Johnson] on it. The best thing, by far, in Fast Five...Dwayne Johnson hulks through the movie leaving testosterone trails in his wake."
(If you want the links just go to Wikipedia Fast Five, it's all there)
Five very legitimate film reviews all praising Johnson.
Again, he's not going to win an Oscar, but he's the best action star we have right now.