Dunno if this is unpopular or if it's just unusual, but when I'm playing a PC shooter, I like the next weapon to be the mousewheel scrolled down and the previous weapon to be up. My logic is that it's like scrolling down a webpage; if I want to see more I scroll downwards. I've been playing more modern shooters recently and all of them have it as the opposite and it throws me off every single time. I dunno, scrolling up to get to the next weapon seems off to me. I get that it represents the weapon number, but when I'm in the middle of a firefight I instinctively scroll down to get to the next weapon.