I have a lot of gripes with the new system but at the root of it all I feel that the ranking system wrongly assigns you a number that is not reflective of your skill and is instead all about your team win average, of which you only have control over if you team with consistent players.
Solo queing is already frowned upon by most players because of the stresses it causes with coordination, but being punished so harshly because your team is just not working together is just frustrating. Especially when you or others on your team are doing a very good job overall.
I hope they fix this in the future so that the ranking shows more about your personal skill and less about how your team occasionally gets screwed by the system (Looking at you Sudden Death)
All I can say is if you haven't started playing Competitive yet, play with friends. Playing alone is a HUGE waste of time.