Don’t worry, you are absolutely right and I understand what you have to deal with. Now rated games at 1700-1800 mmr are approximately equal to games of 2800-2900 in SL2 season. In fact, there is already a topic describing this problem.
The backbone of the ladder has always been people queuing up to get a transmog or a gear that usually upgrades as a duelist. Now all these people (that’s a really large number of participants) who usually played until 2.1k are playing solo shuffle, and they don’t have to queue in other brackets anymore. Accordingly, in the 3v3 ladder, only super sweaty players remained who, in the hope of getting a gladiator, but in fact they can never get out of 1.9k until all these players (who farm transmogs) return back to the 3v3 ladder.
I am really sorry that you are faced with this situation, you are not alone, the most important thing is not to get upset. Hopefully Blizzard will make an artificially inflated second season, we can only hope for that.
In fact, you can see for yourself. Blizzard has made a bloated RBG this season. You can play it and confidently get 2000 and maybe even 2400 (As far as I understand, they alternate artificially inflating one of the ladders every season.)