Ok here's a couple of thoughts that I think are important. I've heard both positive and negative comments about the demo and I kept wondering how opinions could be so divided. I downloaded the American demo last night and played about 10 games on it. I felt so disappointed. Everything was sluggish, the commands were not as responsive as PES 2013, the menus were slow, the passes were wrong, etc. I could not believe it, but I read a lot of comments of other people thinking the same.
Today I downloaded the European demo (which I downloaded from the Spanish PSN store) and it is VERY different. Both play at roughly the same speed, but the controls are much tighter and everything just seems smoother. In other words, it was much more playable. The American demo reminded me a lot of the first PES 2013 demo last year that had problems with the control responsiveness, and the European version was leaps and bounds better. I played another 10 really satisfactory games (I could not stop myself, which was not the case at all with the American version).
So just for the sake of it I decided to download the Japanese demo to check if there were any differences.
The Japanese demo plays much faster. Everything seems more frenetic about it. Whereas in the American and the European versions you are forced to slow down, receive the passes, control and then not come out as if your player is a missile, in the Japanese version there was no incentive to do this. On the contrary, it was as if I was actually encouraged to keep my finger on the R1 button. Controls were a little tighter than the American version, but not as much as the European version. I played 5 games, but I did not like it as much as the European one. The European version plays the best to me because I feel that I have more control over everything, that I can plan my attacks better and that I can do almost anything that crosses my mind. In the Japanese version this was not the case because everything was too fast and frenetic, and in the American version doing anything was just impossible because the controls simply did not respond.
So, I know all versions are labelled "Demo 2", but I have a feeling that within that "2" there were different versions: Version 1.0 (American), 1.5 (Japanese) and 2.0 (European) as they stand right now. Even the European is still a little sluggish in terms of control response, so I hope that they work that out for the final release.
For those who downloaded the American version trying to get a feeling of PES 2014 as soon as possible, download the European version and see if it is better. It was MUCH better for me. I hope this helps.