Just saw this film tonight and liked it. Nothing cerebral here (not that I don't also like cerebral), just a fun ride fueled by pure adrenaline and testosterone. Enjoyed Dwayne Johnson in it -- always a real presence in anything he's in. But it was really Vin Diesel's movie and he seems made to play that character.
Aside from all the fast action and muscle cars, I also appreciated all the muscle bods, especially those of Diesel and Johnson. I also liked Matt Schulze's bod. I'd love to get together with any of them anytime. And we'd drive more than just cars; we'd drive each other. Too bad they all kept their clothes on -- it would've been more satisfying if they had shown at least as much skin as the women.

I kept hoping they'd take off their shirts and expose those ripped pecs, abs and delts. While they're at it they could take off their pants and show & tell us all about their thick quads, hams and -- yes -- glutes.
As expected, Diesel + Johnson at one point became essentially a couple who had a little difference of opinion, which grew into their big fighting match, mano a mano. It was this film's substitute for their big love scene. (A similar scene happened between Diesel + Schulze, Diesel apparently keeps his relationships very open in this movie.) My naughty side wishes they'd have done so completely naked -- sort of like a bodybuilder's duet version of Viggo Mortensen's steam room scene in Eastern Promises.

Personally, it seems to me that, given the physicality of each, Johnson would've been "on top" of Diesel more and ultimately knocked him up -- er, out.
There were lots of good looking guys in the film, including many of the smaller roles, especially for those into muscle. I also thought Sung Kang was quite good looking. But my favorite in this film was Johnson (aside from the goatee, which I kept wishing had been styled differently, trimmer): good looking, huge, muscular and cut. And owning almost every scene he was in. One of Diesel's best features, aside from his body, of course, is his voice. I just like that deep, slightly rough & gravelly voice he has. Sexy.
Overall a good film. Perhaps a tad longer than necessary, but if you like sleek, fast cars, high-octane action and, driving it all, lots of good looking, muscular guys, this is the film to see right now.