I get the complaints about the engine noise, I really do. But all the other rule changes? I think they've definitely improved the sport.
I remember a time not so long ago where overtaking was almost impossible - now we're seeing moves being made up and down the field on a regular basis. DRS, KERS, aero changes, I think they've all been positive steps forward. Going back a bit further, the cost control changes were something that had to be done too.
Probably the most boring part about this season is that Mercedes seem to be light years ahead of the competition. That's not necessarily a fault of the rules though, it's happened before and it'll happen again (Brawn's initial season, the Ferrari/Schumacher period, Vettel and Red Bull at the end of last season, etc)