Not sure if this isn't correct.. I'm on an 80% winrate and win quite easily. Surely I'd be vsing better players by now
It's not really up for debate it's directly stated by the developers. And it's only been one week (for a minority of the playerbase..) in and most people are playing campaign, trying various playlists (likely with their own trueskill), etc... even if its got you higher it takes some time for everyone else to get sorted as well and be found before the game widens search parameters to get a match going. The matchmaking itself will definitely be looser in unranked modes than it would be in ranked, but as long as there is a half decent population it will get tougher.
And it's not like people can't go on long win streaks to start off other games. After my rank got reset for skipping a couple seasons I made it to 72-3 in ranked 1v1 of Starcraft 2 (a notoriously competitive ladder) before it had me properly adjusted and I resumed winning 50%. It's why "smurfing" is a thing.
Regardless, I do hope the actual ranked mode comes soon. Just don't think people should be completely dismissing matchmaking 2 days into the normal release.