I'm generally all for leaving other types of Crucible matches when they're imbalanced. I do it all the time in Control, because the matchmaking there is so godawful, and I'm attempting to enjoy myself. But please be courteous don't drop out of of Elimination or Survival matches. If you're not going to stick it out, then you have a simple and alternative: don't join in the first place, and just play a different game mode. I get it, it's freaking frustrating when you're getting stomped by other players that turn out to be way better. But stay in it. Please.