PES2018 can be good or bad depending on your preferences really, I really like the game, but it's flawed in many ways, and those flaws can break the game for some. On the ball there's very little to complain about, it feels amazing, it's a good mix of the players having weight, but still being responsive, also the passing is sublime on assisted and manual settings, probably the best game when it comes to how FUMA feels, I love having possession and creating chances here, it's a good time, it's not all perfect though...
The main issues I have is how there are very few fouls, especially compared to games like PES2011 and PES2012, you'll have many matches with zero fouls. Another issue is that the game is really biased towards the wings, it's very easy to lose the ball when playing on the middle, due to it being overly closed, most of the time I try to get a shot it's either blocked or I get tackled. The wings feel very open however, and due to crossing and heading being very snappy and feeling good overall, it's how I score most of my goals, it feels nice, but it can get repetitive. Don't get me wrong, you can make some nice plays and score good goals though the middle, and it feels wonderful to pull it off, but the game's bias towards the wings is hard to ignore at times.
I think the biggest problem though is the CPU AI, this whole thing of the wings being open, no one takes advantage of that more than them, it usually goes like this: They get the ball, and pass to their unmarked striker, which holds the ball until the wingers come, then he plays a lobbed through ball to one of them, and they try to get a cross. If you play PES2018 get used to defending against this, because it's the one attacking strategy you'll be defending against all of the time, it suffers the same problem as the attack really, with the repetition making it get stale with time.
It's a game best enjoyed in short bursts, if you play it a lot many of it's aspects can be very annoying, however playing it more sparingly makes the good aspects pop a lot more, and when this game is good, let me tell you, it's sublime.