I think open queue is fun. One thing I really like about Rivals is that I get to play more than one role.

The biggest problem is really just that the lower you go the less it works, people in higher ranks are all able and willing to fill 90% of the time so you almost never get super fucked teams with only 1 support or 1 tank unless it's a real comp. I don't see how this can ever be fixed either, role queue is probably a necessity because of this alone or you're dooming the vast majority of your playerbase to unplayable games.

In an ideal world 6v6 would still be the main mode though, for sure. I'm a 5v5 defender and even I can acknowledge that.