Sadly, the game all but forces you into GM content. I'd prefer to stay at master, but with the leveling treadmill that's been created, the game makes you feel like your time is wasted there once you get above 360ish (especially for matchmaking content). People grind solo for efficiency, but then their power level forces them into content above their skill or desired difficulty. Not sure how many people want to hop in ftf and haggle over modifiers or blindly trust someone else's choices. I certainly don't.