It depends how important realistic pitch speeds and repertoires are to you. One of the main gripes people have about the game (it was even pointed out in the ESPN review) is that the pitch speeds assigned are not accurate out of the box. SCEA has alleviated it somewhat through roster updates, but they obviously haven't updated every pitcher.
Edit:
This usually flies under the radar, but I also included pitch fx data for nearly 300 minor league pitchers, as well as correcting fastball/changeup separation and slider movement for the rest. For me, this was equally important as fixing the MLB guys since you will be using the minor league guys in year 2 and 3 of franchise anyway.