If hardcore means playing nothing but shooter games, I'd rather be a causal. I enjoy a good mix. But I will never pick up any of the Wii casual shovelware.
more hardcore, when i play a game i really get into its story then if i liked it enough ill go back and get as many achievements as i can or try to complete them all. i also play online call of duty pretty hard core, i have like 10 days logged on it since it came out
edit* was referring to mw2 for the 10 days thing, i also play cod 4 still once every so often. that game was soo much fun.