The level of referree'ing for the sport varies a lot - not just in MLS, but in the World Cup as we saw, and that can be frustrating.
The game day experience at Rio Tinto is what sold me though, it's an open air cathedral of sport and if you take heavy expectations off, it is a lot of fun to go to games. Once you do that, you get into the players and the tactics and the evolution of the team.
But I can see where you're coming from. MLS isn't as fast as the World Cup. It's more physical. The skill level isn't quite as high.