NASCAR died for me after I started watching WRX and some of the European stock car racing on road courses on SPEEDVISION. They drove factory cars modified with cages, racing engines, transmissions, and axles, but look mostly like what I could purchase tomorrow, if I lived in Europe. Plus the racing on road courses was very aggressive. More than left turns helps too.
The only thing enjoyable about NASCAR is Bristol and the massive wrecks. I can't tell you the last time I watched a race start to finish.