I didn't find it boring at all. Sure, it would have been cool to see a larger group get away, particularly one with a few more of the heavy hitters, but the thing with what happens at this race is that the strongest guy is almost always the winner. Team tactics play a role for a while, but eventually the attacks come, and the truth is revealed. Remember, FC rode Boonen off of his wheel at Flanders a week earlier.
So for me it was a thing of beauty to watch Cancellara ride away like that. Talk about stamping your authority on the race.