Aquarius wrote:

Moto GP is more fun, it goes faster and all.

Nah, seriously : less doping, makes a level playing field, most leaders are at the edge of what can be done clean, and almost all of them have the same level, or close to. Add to that that they don't look at each other but climb almost as fast as they can, and that leaves almost no room for accelerations, sci-fi style attacks, etc.
Also, less of them have bad days due to a bad timing for transfusion or a poor assimilation of the extra red cells (or a bad day due to the absence of a refill the day before).