I've only played the demo and I can say a lot (I have the full game now as of 8/27)
Pros: Gameplay is much more smooth than Fifa 18
Graphics and atmosphere is very good
Champions League, simple
Cons: Speed is worthless, you can have 79 sprint speed David Alaba catch up to about 94 sprint speed Kylian Mbappe
Tackles don't make sense, you can tackle someone and the game starts executing scripts to give the opponent a sprint boost and still have the ball
The one I might hate the most, the fact that the AI is so op and can block and save any shot you take. Ronaldo shoots? Blocked. Neymar? Blocked. Lewandowksi? I think you know already
There are many cons, and all of them are big. Fifa 20 better be an improvement even without Juventus in the game
Edit: Also can I say that simulations are awful. I lost to Newcastle on my Man U career mode just because I was away. and it's happened multiple times. Fix this