I think the DRS, while the rules are still a bit mickey mouse, does have a lot of scope for improvement.
I can see on tracks like Spa, china, Monza etc.. it really will make all the difference. Melbourne is a bit hard to judge because of the short zone it was allocated for use.
Redbull really is going to have to up their top speed if they are going to keep the more slippery cars off their back on the long straights. Not having KERS is really going to hurt them