Being good at FFXI is not subjective.

Enjoying FFXI? Sure. But if you can't be good at FFXI and still enjoy it, it's a personal problem.

There's a time and place for dicking around on NIN/RNG. I've messed around with it, sure. Same with some other weirdo job combos; MNK/PLD comes to mind (and wasn't too bad at the time), same with WHM/PLD. But I dicked around with them on my own time, in the middle of nowhere, where I wasn't negatively affecting anyone else's gameplay. I had some fun experimenting, and no one else got screwed because of it.

When other people's playtime is being influenced by me? If I'm in a busy zone, or in a group? You bet your ass I'm going to perform to the best of my ability, even if it means doing something the "Cookie Cutter" way. I still have fun because I enjoy the company of the people I'm around, and I enjoy accomplishing things with them. I could care less what job I'm on, or what strat I'm using, because those are completely independent of the fun for me in a cooperative multiplayer game.