8. Vin Diesel
Clearly when discussing Vin Diesel in the context of lazy actors his physical ability doesn't come into question - if there's one thing you can say about him it's that he invests a lot of time and energy getting in shape and making the most of his muscles on screen. Physical ability aside, however, and it's the muscles in his face which are in dire need of more of a workout. Diesel nearly always looks as if he's fixed a frown to his face the moment he walks on set and leaves it there permanently until the director yells "Cut!" There's nothing wrong with poker-faced heroes but even a small hint of personality beneath the stern expression goes a long way. Vin Diesel might have earned a fortune playing the action hero but it would be nice if he returned to more ambitious roles - Boiler Room and Find Me Guilty have shown that he's capable of more.