I personally think it’s a much better game than previous years. I can’t remember fifa 14 so I really couldn’t tell you if the tactics are better or worse, there a a few other types of player roles which I think make the tactics part of the game a little better but there aren’t massive changes to tactics. The gameplay presets (authentic and competitive) are really good in my opinion and the physicality of players is MUCH better than previous games you don’t just get shoved off the ball when you try a shield it anymore.
If you want to know anything else reply and I’ll try and answer your questions.