A little surprised this game didn't come with MLB rosters, since the latest FOF and DDS:PB both had pro rosters. Let me quest, I bet it's player's union related.
I'm just one of those that will start in 2007 rosters and create history from that point. It's hard to get into a complicated game like this (at least in the beginning) with fictional players. I may try a fictional league down the road, but only after I get the feel of the game with actual players.