I'm usually in the scrub category and I try to avoid committing the behaviors that I profess to dislike. As for the CoD example, I don't think there is anything wrong with using the "noob tube." It's a legit weapon, although it really sucks when it happens to you, so I avoid it.
I'm not a fan of taking advantage of glitches in the game, despite the arguments for "the developer left it there so I'll use it." That argument does make sense, but for me it just doesn't seem sporting. Just because something is broken doesn't mean it should be exploited and considered "fair." Although on the other hand, everyone has access to it, so the playing field should be level, for no one is restricted from using the glitch by anyone other than themselves.
I guess to sum up my opinion, I try to play in the spirit of the game and its rules and less to the letter of said rules. The number one rule in a campus game organization that I'm in puts this wonderfully: "Don't be a jackass." If you are seriously ruining the game for everyone else and time is being taken away from the game to address the issue, you should stop.
