Laugh at me if you want, but as a kid who grew up with all the Playstations until 4, a GameCube and a Wii, until Halo hit PC I never tried it. I'm playing CE and like it so far, and I really dig how if you press tab it switches from the updated HD grafix to the old school original.
Also when is ODST coming out? That's the only one I remember as a kid spiking my interest, because instead of beefed up ubermensch in a super suit, you're just a loser who gets shot out of a perfectly fine spacecraft and armed with a peashooter expected to do amazing things. That and the trailer, with the Welsh music and Hungarian screaming. P.S. if you ever wanted a clear version of the ODST trailer music, for some reason that atrocious Arthur movie by Guy Ritchie has it on the soundtrack.
I'm not making this up.