DRS has been good and bad.
I would prefer to see changes though, to allow more real world advances. When i get a DRS on my car I'll see the real point, KERS advances would be far superior and I've said so for a couple of years, harvest and store as much as you physically can and release as much as you want whenever you want, that would show benefits for racing and the road car.
White wall tyres will always get my vote too, I know they're trying their best to get them fully introduced but the line is too thin. Also, the red/yellow/blue/green colours aren't pimp enough.