Also, some of us have the unconcious habit of pressing "R" whenever they're not in a firefight. I just gave up on the SMG because I'd fire a few shots (perhaps 10 bullets) into some grunts, hide, reload, and find I was running out of ammo ridiculously fast.

Even in games without R as a reload I find myself reloading, like UT2K4, where it's bound to a chat key.