Let's classify Arsenal's players

Reason: If you understand their ability, you will not over-expect them

Class 1 - Fabregas, Van Persie, Vermaelen, Rosicky(if no more injury)
Class 2 - Arshavin, Nasri, Song, Eboue
Class 3 - Diaby, Clichy, Sagna, Vela, Almunia, Gibbs, Djourou, Ramsey, Walcott
Class 4 - Fabianski, Bendtner, Denilson
Unclassfied yet - Chamakh, Koscielny, Wilshere, Szczesny

Note:
Class 1 - Players with ability to change to game
Class 2 - When they are good, they play good football
Class 3 - They are in the team but you do not expect them to shine
Class 4 - What you want is they can do things right.

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Legend:
Class 1 - Henry, Pires, Bergkamp, Ljungberg, Vieira, Cole, Campbell
Class 2 - Wiltord, Gilberto, Lehmann, Toure, Adebayor
Class 3 - Edu, Lauren, Parlour
Class 4 - Senderos, Baptista, Cygan, Stepanovs