I'm well aware of that, but that really isn't impressive considering this isn't Bird's first go around in a GP2 car. Hence the fourth position he holds. Good talent is a subjective phrase I'd say since it is consider one of the more lacking seasons. As for Frijins and even Rossi (he did finish 3rd in 2011) they seem to be close in strength like the WRS careers showed, but they're new and I wouldn't be surprised to see them at the top next year where Nasr is. The cars from WSR to GP2 are quite different and it's obvious you can't jump in and be as fast as established drivers unless your the next Vettel, Alonso or Hamilton.
It's not the same as WSR, but Rossi and Frijns have raced in powerful cars before, while Mitch Evans hasn't and is arguably outperforming both in his first year in any big car. The two just aren't performing. Frijns has the revolving-door at Sauber and Hilmer excuse, but Rossi is very experienced in single-seaters now and has experience with the Pirelli tires from GP3 and F1 tests, he should be doing better.
Look, I don't understand why you don't rate Nasr: Nasr beat the guy who leads WSR two years ago as teammates in British F3 and has had a good career in GP2 since. The problems of GP2 (fragile tires, current tire rules, lack of practice time, lottery qualifying, reverse grid sprints, several lunatics scattered through the field) make it hard to stand out, but Nasr has shown several skills (tire preservation, Q speed, patience and ability in overtaking) that are relevant to being good in F1. But you are welcome to your opinion, of course.
I count far more than 2 overall, from the rookies there are three off the top of my head and that is Chilton, Van Der Garde and Gutierrez. Also Mazzacanes was no worse than Diniz who is probably the biggest pay driver of them all in my opinion. Either way they are drivers with far more money than talent.
Gutierrez is a Gp3 champ (over Wickens, Rossi, Coletti, Nico Muller), a race winner in GP2, and finished 2012 in 3rd place in GP2. He was more accomplished coming into F1 than Raikkonen, Sutil or Button for example. I too would wouldn't have promoted him over keeping Kobayashi, but the case that he didn't deserve a chance in F1 is rather hollow. The fact that he brings money is irrelevant when he has impressive enough qualifications.
Chilton and VdG have less of a case, but still both have multiple GP2 wins and have finished top 5 in the GP2 championship, so they're clearly not hopeless mugs. They're both a world away from the likes of Diniz and Mazzacane who NEVER won any races against decent opposition in lower formula. That would more akin to the likes of Canamasas and Sa Silva getting seats, and that's clearly not happening. You try to make it seem as if F1 is populated by many low level pay drivers but that clearly isn't the case, in fact the overall quality is probably the best it's ever been.