Crucible is a very valuable tool, but it is new so it is misunderstood.
There is too many people complaining, because people quit games on crucible. Personally, I think that people need to get over that idea.
Crucible is for deck testing. Sure, it's fun to see who wins .... but, I don't think that is the main point of it (at least at this juncture).
People are going to quit when they get bad draws, or when you get them caught in a bad combo. People aren't going to stick around and waste time on a lost game. They're going to start a new game, and maybe test a new deck or hope they get a better draw.
I don't see a problem in quitting. It's what happens so that people can test more!
Do you quit games, or does it upset you when opponents quit?