What's wrong with Quick Play?

I've been trying to play Tracer recently to learn how to have better movement with her, but I can't get any practice in because every single team I play against is absolutely cracked. I can't flank, I can't practice my blinks because I die immediately, I can only feed. People say just get good and practice. How am I supposed to practice when the supposed practice matches are just me watching a respawn screen movie? It wasn't this bad a few months ago. The worst part is, even though I get overwhelming deaths to kills ratios, my elo never seems to go down and I'm stuck in a never-ending nightmare of feeding, getting mad and closing the game, only to wake up tomorrow and do it again like the worst Groundhog Day ever. Is it too much to ask to be put against players nearer to my level so I actually have a chance?