Actually, NASCAR was a really interesting thing back in the 60s and early 70s when the cars were little more than hot-rodded street cars (although, Ford, Chevy, AND Dodge pulled some tricks--like producing exactly 500 street versions just so they could race). But it lost a LOT of its interest (for me, anyway), when the series went tube-frame and non-production engine. The V8s that they run really aren't even versions of the V8s any of the companies currently produce--if they're akin to anything, the small-blocks from the 60s come closest (but the NASCAR engines are still VERY different than those).
The biggest problem I have with NASCAR is that its turning into "entertainment". Like wrestling is "entertainment". There's no reason to root for a particular manufacturer--when the cars are completely arbitrary (its not like the Monte Carlo you're picking up at the Chevy dealer has ANYTHING to do with what's driven on Sunday at the track). And I'm personally worried about the Frances (the OWNERS--yes, it is wholly owned by them--of NASCAR) giving "the call" when they think it will make a good story. I'm not saying every week.... I'm not even saying every season. Here's a series that prides themselves on the equality of the cars (look at all the adjustments they make to ensure competitiveness of the cars--which stifles creativity and engineering, but that's another story). But there have been some races where some people have literally pulled away from others on the straights. Quickly. Smells fishy to me.