I like to mix it up. I use a wide variety of tactics even within a single game. In Call of Duty 4 for instance I usually use assault rifles at mid-range, but I'm equally handy with a shotgun, pistol or SMG at closer ranges and often make heavy use of explosives such as C4 and stun grenades. I make use of perks like "Dead Silence" in quieter matches so I can sneak up on enemies, and combine the "Stopping Power" perk with accurate rifles like the M14 to effectively drop enemies at range with just a few shots. About the only thing I'm not all that good at in this game is sniping, though if I do use a sniper rifle I do a lot better playing offensively than defensively.