When newer players start out, and the very first game they play is against a team with two smurfs on it, they tend to be a bit discouraged. It's not good for a game when the incoming population essentially gets the message that they aren't good enough to play this game, especially on the very first one they play.
Then again, I remember my first game. I got stomped by what I would now say were obviously smurfs, and that motivated me to play more so I could get better.
Then again, I'm strange. Or, at least, not among the majority.