The current TG ladder is still a mess, because of the inflated, which was part of the old calculation. As long as that is still present as part of the game, then match making pretty much suxs. There are still 2.5k players that just played a lot, but still are trash. If you got some of them in your team, while the enemy dont have those, then you are already guaranteed to loose that game. That doesnt even have to do anything with queueing solo vs queueing as premade.
Then there is another issue with match making systems in general: At the top and bottom the number of players begin to get scarse. As result the gaps in Elo between teams start to increase. This is also true for 1v1. If you look at the games of TheViper you sometimes see that he is matched against a 19xx or 20xx player. That is just the result of to few other players in the queue at that time. For team games this issue might be even bigger: You need 4 players. So if you have 4 top players on one side, then the game have to look for 4 other high rated players. Since there are few players in the top, you might end up with just some other players with a rating that is a little bit lower.
I think most issues will be mostly solved after a full reset of the ladder, now the devs finally fixed the inflated. They might have to make some other small adjustments (to prevent the smurfing to elo boost a main account) and team games would be much better.