Only played a handful of games so far (15 min matches) but have enjoyed it.
Got destroyed by Messi and Suarez which is easily done... was 2-0 down inside 10 mins as first Suarez held off my defender before chipping the ball for Messi to take down and score. Then a few minutes later Messi on the right hand side gets to the byline by dribbling past two of my defenders and cutting it back for Suarez to fire in.
Also had a funny moment where I was losing as Bayern against Arsenal late on and from about 45 yards out Aubameyang takes an instant shot... because Neuer is naturally pretty far off his line.

Neuer stumbled to get back and the ball deflected off him for a corner.
I do feel there is a lot more error in passing, shooting etc. Good to see some shots scuffed rather than being laser guided all the time.
Still feel the CPU could do with being more aggressive, although its definitely a step up from the previous couple of games. Can understand why so many are unhappy with the refs but don't have a huge issue with them to be honest, seems more realistic if anything. Although as always seems the CPU gets away with a lot more.
Downsides as mentioned before the colours are far too saturated although that can be adjusted. The sound seems worse than ever, honestly don't know how they haven't improved this yet, crowd is always dreadful!
AI does seem better especially going forward although sometimes seem a bit toothless. Half the time Messi looks dangerous as ever but other times just seems to hold on to the ball. Would be good to see the AI more dangerous in the final game but hard to see them doing this without cheating, also have to take into considerations these are only friendly matches.
Overall I'm pretty happy with how it plays, but of course do fear that this will be nuked come release so definitely won't be pre-ordering. But I do feel its taken a lot of the best parts of this generation of PES games to put together something very decent, however I want to see if I still enjoy it after playing a handful of games every day over the next week before getting excited for the release.