The game itself is a great improvement from 14 (especially as it's my first next gen fifa) the graphics are brilliant, and the gameplay feels smooth.
The complaints that I have are:
Scripting - Really does annoy me when it goes against me, but doesn't seem as bad as last year.
EA Server - Don't have to explain really...
The fact that EA aren't doing enough to stop coin sellers... It is ruining the game!
But overall the game's pros outweigh the cons in my opinion.