DRS had an interesting introduction in 2011. Sometimes it worked fantastically. China was actually a great race this year for those who remember although this probably had as much to do with failing to understand tyres as it did with the use of DRS. Jenson would never have been in the position to take the lead on the last lap had he not had the benefit of DRS down the back straight. But of course sometimes it failed miserably. Sometimes it didn't help. Melbourne and Valencia weren't affected by DRS. DRS in Turkey made passing ridiculously easy. Barcelona actually had a lot of passing but this was all in the infield and had 0 to do with DRS. And, who can forget Lewis in Monza opening up the rear wing and getting stuck on the rev limiter lap after lap.
My problem with DRS is where they decide to use it. Although we are quick to forget it, some tracks actually used to have passing without DRS. Given a little bit of tyre wear difference it was always possible to pass people down the back straight in Montreal or outbraking them into the first corner in Brazil. So when you bring DRS to these tracks why does the FIA insist on putting the DRS zones in places where overtaking was always possible. Instead of putting two DRS zones on the two longest straights in Montreal why not put it right in the middle of turns three, four and five. Let's see who has got the balls to open up the rear wing while following someone through some flat corners. Let's make overtaking opportunities out of sections of track that were never opportunities before. Screw opening up the wing heading down the pit straight in Monaco. Open it up on the way up the hill. Let's see people considering taking a dive down the inside coming into Casino. Forget a DRS zone down Kemmel, put one right bang in the middle of Blanchimont. That I would love to see.
The way DRS was used in 2011 and doubtless how it will be used in 2012 is to create more passing. What I would prefer would be for the FIA to use DRS to create more areas on a track where passing is possible.