I've been trying to resist coming up with a list for myself but I've given up so here it is (based on the current 24 drivers):
1. Hamilton - I am a biased Lewis fan, so he is my number one out of the elite three.
2. Alonso - I still feel Fernando and Lewis have a bit more than Seb if they were given the same car.
3. Vettel - His performances this year solidifies his place in the top category for me.
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4. Button - I think he's the 'best of the rest'
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5. Rosberg - Given the chance I think he'd do a similar job to Button, but I'm a bit uneasy about placing him so high.
6. Webber - Disappointing 2011, but still a race winner. Fast in qualifying and not afraid to get stuck in in the race.
7. Massa - Out of Alonso's shadow he can be a great driver, as shown in 2008.
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8. Kobayashi - Pretty much always makes progress in the race, outperforming the car in general.
9. Sutil - Disappointing start to 2011 but always ends the year with a good points haul with one or two stand out drives.
10. di Resta - Had too many accidents this year but for me he's got an exciting future.
11. Kovalainen - Struggled at McLaren but otherwise proven to be quick and kept his head up at Lotus
12. Schumacher - Slowly seems to be regaining his form, much more competitive with Nico this year
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13. Perez - Perhaps flattered by a Sauber gentle on its tyres but a promising start nonetheless.
14. Buemi - I feel both the Toro Rosso drivers could do decent jobs in a better car, but it's difficult to tell how decent
15. Alguersuari - See above, Buemi probably has just edged it in the team-mate battle so far
16. Petrov - Much improved this year but still hasn't convinced me completely
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17. Glock - His stock has been reduced significantly by moving to Virgin unfortunately for him
18. Barichello - Offers great experience but F1 is perhaps starting to leave him behind.
19. Trulli - Race results compared to Heikki are pretty good but seems to spend most the time moaning
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20. d'Ambrosio - Done fairly well but it's very difficult to judge him based on half a season in a Virgin
21. Maldonado - For me the least impressive of the establisihed rookies so far but Spa might be a turning point.
22. Liuzzi - I've never been all that impressed by him personally
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23. Ricciardo - Seems to be matching Liuzzi now which is promising
24. Senna - Strong qualifying at Spa but quickly found an accident in the race
When you try it for yourself it quickly becomes apparent how difficult it is! Even in my own list there are things I'm not really happy with! I was trying to do it based on who I would want driving for my team if I was a team owner needing to hire drivers now. The lines separate blocks of drivers who I feel are at a similar level of 'desirability' (in terms of current performance and potential). Ricciardo and Senna are more like 'unrated' rather than 23rd and 24th because there really isn't much to go on for them.
Well I've spent far too long doing this, feel free to comment and criticise my list! Good places to start would be "Why the hell is Schumacher so high?" and "OMG you are such a Hamilton fanboy!"
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P.S. I've got no complaints if it's decided this should go in a separate thread.
EDIT - On reflection overnight I've decided to bump d'Ambrosio up a couple of places and I've fiddled with a couple of the lined boundaries a little.