Are Arsenal good enough?

Here is a question posed by most Arsenal fans: 'Are we good enough to challenge for major trophies?' 

In an attempt to answer this, I have done an analysis of the first team and subs of the three teams most likely to challenge for the premier league title.

Arsenal:

Manuel Almunia

Gael Clichy

Thomas Vermaelen
Laurent Koscielny
Bacary Sagna
Samir Nasri
Cesc Fabregas