I put Halo down for a few months.. - then, pick it up again, and that's it - i'm hooked once again. I've completed it on Legendary - Co-Op. I've completed it on Heroic - by myself. I'm currently going through it again on my todd, Legendary. But am I missing out on any good FPS out there? I'm wary of buying games as quite often I'll buy one, but only play it for a few weeks.. - and that's it. On the shelf collecting dust. I've been considering Rainbox Six 3.. - is that a comparable FPS?? Cheers.