I've found that as your loadout becomes progressively more powerful, caution takes a backseat to aggression. Take this week's Nightfall for example. Tried that playing very cautiously, keeping my distance with a sniper rifle, and wiped repeatedly. The winning attempt was where we all unloaded on Taniks at every opportunity, took the fallen walker out before he could spawn any adds, and then killed Taniks from focus fire in the final chamber within about 10 seconds. ...of course, all that will go out the window when I try Skolas. That fight looks like a b*tch!