I will agree that there are some problems with matchmaking, but for the most part I don't really see it as much of a serious issue some others here. My win rate is about 50%, seems pretty balanced. I think that tier 2s shouldn't go against tier 4/5s, but a 1 tier difference isn't bad when skill is also factored in. I had game where my team was a player short and only tier 2/3, going against a tier 3/4 full team, and still almost won. Yes they were using ships that were more powerful, but if they don't know how to use them it doesn't matter. Most of the time when a match is one sided its because one team is only using one tac. cruiser.
One thing to keep in mind: This is a beta, they are working on it, and this is a relatively small group of people playing(compared to other games). Im fine with getting some challenging matches and get better, than have extremely long que times and only get put up against/with people with the same tier ships.