http://www.wrc.com/video/highlights/ I am not into NASCAR at all (it is pro wrestling with cars IMO) but I do enjoy watching this form of racing. They actually use stock vehicles that are "heavily" modified to race. Check out the highlights from Sweden...snow, ice, looks fun.
I've not watched any WRC so really don't have an opinion. I'll check it out sometime. I used to watch NASCAR but just can't get into it anymore. It seems to be just about surviving for the last 10 laps when the real racing begins. If they wanted to make it more interesting, they'd do away with the teams format. I think it creates too much of an advantage when some drivers have a "teammate" when others don't. And awarding points/money for leading at 1/4, 1/2 and 3/4 of the race might make things more interesting.