Toshiba Qosmio x505-Q880 - Good for Gaming!?

Hi guys
i was almost zerod in on building a custom babe but i saw this "Qosmio x505-Q880"

Is it worth ditching the custom rig for the sole purpose of gaming?
Pardon me am not a pro in GFX Card wars.

Lappy Specs
Toshiba Qosmio X505-Q880 Laptop

Thanks,
-S