I'd prefer something like the DMR or the Mattock from Mass Effect 2. A high-powered mid-long range rifle with a large magazine, that can be fired quickly at the cost of control if shit hits the fan. Basically something equivalent of a real life 7.62 NATO battle rifle. Other than that, I think I'll use shotguns rather than SMGs for close-range combat. I'd prefer a slower weapon that kills quickly over a rapid-fire pea shooter. An automatic shotgun would be awesome. As for the big guns, I'll take a rocket over an LMG, unless I'm working with a team and filling a ranged support role.