Well I JUST finished the option file haha. Took a little over an hour and a dime.
From the reviews, apparently it's still easy to score (from what people are saying compared to the other PES years) but that can be changed by changing the difficulty. Sadly, its not quite as in-depth as FIFA when it comes to the info, but it's gameplay is far superior, and actually really fun to play. 
And yeah, you're right, the graphics are ok (not quite on the same level as FIFA). However, the teams which ARE licensed and the superstars (Messi, Ronaldinho, C. Ronaldo, Kaka, etc.) are lifelike. Easily the graphics and player faces of the licensed players are spot-on it's actually kinda scary and MUCH better than FIFA's. Too bad they can't do it with all the players, which I believe they eventually will (once they start raking in more money and get the licensing).
Thats all i can say so far since I haven't finished a full game yet haha. One thing for sure though, if you put your time in with the option files (I chose WENB, tell me if there's one out there better), this game is really awesome. Obviously, there are some problems out there with this game, but i've yet to encounter them. I'll post more as I get more acquainted with this badboy.