I didn't like Vin because of the stupid, stupid, STUPID movies he has a tendency to star in, but he seems like a pretty good guy in real life:
"Vin Diesel has been hailed a real-life hero by a lucky dad after the XXX star stopped to save a family from a car inferno. The action man pulled his motorcycle to the side of Hollywood's 101 freeway after a vehicle in front of him toppled over and burst into flames. Quick-thinking Diesel yanked the kids out of the backseat and then urged their dad to crawl out of the passenger door, while trying to keep the panicking driver calm. The whole family managed to escape the flaming vehicle before it was engulfed by flames."
or
"The Fast And The Furious muscleman Vin Diesel came to the rescue of a disabled lady who was insulted by an irate shopper in an Los Angeles supermarket. While waiting patiently at the busy checkout line of Trader Joe's market, an aggressive man started complaining about the service. A lady in line in a wheelchair asked the guy to please calm down, to which the angry man replied, "Oh, it's fine for you--you've got a place to sit. Why don't I just cut in front of you?!" Outraged, Vin went up to the man and told him if he didn't shut up, he'd need a wheelchair himself. The angry man took one look at the actor's biceps and quickly exited the store."