Multiplayer Matchmaking PS3

Concerning Dead Space 2 Multiplayer on the PS3, can anyone explain the game's matchmaking to me? It seems as if something is wrong since teams have been consistently lope-sided. Maybe it wasn't as noticeable when the game first came out, but it seems one team always gets far more max level players. Recently I played a game that was {3 max, 1 level-8} versus {1 max, 2 mid-30s, and 1 level-2}. It's a definite deterrent to new players, which is a shame since the developers beautifully made it so no Dead Space title is made obsolete by any of the others. Thank you for your time and patience.