This calls to mind some sports nut (no offense, sports nuts - any resemblance to characters real or fictional is entirely accidental) saying football season makes movies irrelevant. They're different products, addressing different interests, and impossible to compare!
Fun is ALL you get if you play with friends. No credible story, no immersion, no take-your-time, no investment - just fast, loose, kill-this-now-come-here-hey-don't-stop-to-smell-those-flowers-we-have-to-keep-moving-itis.
Sorry if it annoys you, Insomniac, but I MUCH prefer story, immersion, and similar elements to mindless playground "fun." And if you won't provide it, I won't provide you with my patronage.