1st of all, I understood everything you said.
Yes unranked MMR( or Match Making Rank) has always been trash and will stay trash, you can get paired up against diamonds golds, plats, as a bronze, or not even lvl 30s to fight much experiences players,was talked about in the past and not a thing will change so yeah.
Client bugs, ever since they scrapped the previous client, the beta, it has had like more bugs and such since it's been created from scratch because they had forgotten how to deal with (members leavings and such secrets) yeah you're right for a billion $ company they sure are slow at these types of things, but stubborn to believe they can handle it all by themselves with few experienced staff, (also talked about in the past, still doesn't change)
It's best to move on, it's not worth getting emotional at this, you aren't going to get actual help at all from these naive, ignorant lads cause all the experienced players are gone, they were sick of ritos stuff, only a few remain, and this post will probably never see the light of day either if it's below -1 downvotes since rito <3s having player behavior boards filled with a mirage, farce illusion that it's godworks at all these 10 pages of upvotes.