>No you can't. Overwatch, CSGO, etc, etc. don't have a way to make a team and queue as a team (against other teams).
I don't think this is true. I play Overwatch and I sometimes play with anywhere between 1 and 5 other players as we have arranged to group up before looking for a game. With 5 other players, it's a 6-stack, and I believe that a 6-stack will always be matched against another 6-stack. As far as I know, it takes the average skill rating of your group and finds another group with a similar average skill rating to play against you.
I don't think this is true. I play Overwatch and I sometimes play with anywhere between 1 and 5 other players as we have arranged to group up before looking for a game. With 5 other players, it's a 6-stack, and I believe that a 6-stack will always be matched against another 6-stack. As far as I know, it takes the average skill rating of your group and finds another group with a similar average skill rating to play against you.