I think it's very nice looking.

A couple points though:

1) I think you need a better logo for GamerCity.co.uk in the top left.

2) The PC, XBox 360, PS3 text is not centralised.

3) I don't think the rollover for the PC, XBox 360 buttons and the left menu distinguish well enough what is rolled over. Maybe change the text and darken or lighting the texture.

Nice though.