You know what, iam a true racing fan, you know why? i watch them all.. some people just pick at stuff and critize it because, well they are bored or something..
i watch my nascar for the bumping and rough and tumble fights.. i watch F1 for the pure nuts crazy speed, with Drag Racing, its the smell the the finality of it as, you get 1 shot if you lose your done for the week. austraila V8s, wrc, rolex these guys are nuts, thats just pure skill
too me, its all fun. i like it all, each sport has its issues.
nascar - races are too long on some tracks, same teams win over and over.
F1 - sometimes the Qualifying series are more exciting and have a bigger part in deciding who wins that whats on track.
i could go on and on, but each series has its coolness, and its crapness.. enjoy it all, thats what i do.