(Sigh), yeah, I think that The Rock had a shot at the "next action star" thing but blew it with way too many crappy family films. That Tooth Fairy movie looks like it has the potential to be the worst movie ever made. It's a shame too, because I think he does have some talent.
Diesel fits the action hero mold ever more so, in my opinion, but he too made the mistake of choosing too many bad or questionable projects over surefire hits. Choosing Riddick over sequels to The Fast and the Furious and xXx hurt his career. He may have salvaged it a bit since he did that 4th Fast & Furious installment, but he still doesn't possess that "x factor" (no pun intended) that he had for a year or two. I can understand getting behind projects that you believe in, but honestly... Riddick and A Man Apart weren't half as good as the producers clearly thought they were.
As for Worthington... wasn't impressed with him in either T:S or Avatar, but hopefully he'll be good in Clash. To be honest though, I really don't give a crap about him... I'm seeing this movie for the Kraken and the other beasts, as well as Neeson, Fiennes and Alexa Davalos.