With XP boosters and the ability to sidekick, you can still get to lvl 50 (even twice) without knowing much about the game. I understand the complaint that people ruin endgame activity by showing up without even knowing the basics of the game...bit that's a cultural shift in some of the player base more than anything. People will always find a way to get to the endgame contact without playing much, and likewise, even some people who have played for long and often don't fully understand or appreciate the game dynamics.
Just gotta play how you play and try to find good teammates/friends to call on.