No, it really doesn't. I'm a bad player and I can zerg with the best of them.
Talking to the OP now: What you're seeing are insecure players showing off - to themselves. For some people, video games are like Accomplishment Porn. This is not entertainment for them, it's their purpose in life. So they take on quests, overpowered and twinked out and rush through it. They need to find something more challenging, but they are afraid of failure, so they settle on "running up the score".
It's like chugging a fine bottle of wine, thinking it makes you look cool.