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I think it changes from week to week IMO
first 2 race weekends mclaren looked like runaway champs,
then, although not winning, it was clear on some weekend that the lotus was the best car out there
Mercedes, rose up, won china and seemed like a race winner for a few races (who knows if MSC would have won monaco)
RBR looked like champs in a few races
Ferrari were dogs in the first 7 races, even though they won malaysia, but now look like the car to beat
Sauber is always lurking around the corner and if perez had kept his cool, could have won malaysia
As is the Williams, who won Spain hands down and were the best car. In Valencia (spain again) maldonado and that car were charging up the grid and before his crash, seemed like the best car that day

Despite my disappointment with the macs, I will admit that this uncertainty sure makes the races interesting
The only thing I know for sure is that the HRT and Marussia are clearly the worst

Every other team save caterham, has qualified in the top 10 at some point