Two problems actually, if you don't count the cheaters:
1- It's not logical to lose a round, when you had won the fight with more health than your opponent, but you lose because of "fight duration". Some champions need more time than others to complete a fight, that's their toolkit. Not fair, the end.

2- Fix matchmaking. It's enough that parry doesn't work 50% of the time with your precious beta trash, at least match make us with players that have similar problems. Well, this isn't really something that can be done, I know, then why don't you FIX parry instead?
Thank you and good day.