I disagree with Flavio too, the fact that teams have basically split four ways (KERS/no KERS) x (DDDiffuser/Normal diffuser) has played its part in shaking up the grid this year. But of course they'd probably rather do it by drawing lots for the starting grid and setting off in GP2 cars or something

As far as KERS goes it was a nice idea with a horrible coined name and even worse execution. Why the time-per-lap limit on usage and why does it have to be in the form of a dressed-up "push to pass button"? They should have just specified a maximum storage capacity, and then allowed the teams to do whatever the hell they wanted with it, rather than nannying them through like this.