I think you're right up to a point. What I think has made this season more interesting is the number of wet races. The cars go slower in the rain, which results in less downforce, less dirty air, and more overtaking. Not forgetting the more difficult driving conditions, the slippery white lines (Mark Webber, I'm thinking of you here) and reduced visibility. If circuits could have sprinklers built in, so even if the weather doesn't play ball, you can still have a wet race, I think that'd make F1 a lot more interesting.