This is by far the best fifa ever. I began playing fifa 12 thinking "Woooooah"...it was so different to all the other fifa's. the improvement is massive compared to the previous ones.
Impact engine- It definitely improves the realism of the game but is flawed. You will concede penalties for no apparent reason and there will be some collisions where players react very strangely...Look on youtube it's hilarious.
Gameplay- the shooting is now more realistic. There is a smaller gap in the power bar between hitting a weak shot and smashing one over the bar. I find the movement, passing and playability better as well. It seems to do what I want more. One downside is that I do sometimes feel that the gameplay is a bit repetitive...It doesn't quite have the same unpredictability of real life football. Skill moves are also easier than in past years to learn. They feel more intuitive
Graphics/Presentation: Brilliant graphics, some of the best you'll see on consoles today! game faces are well done although they still look a tad like waxworks. Stadiums and menus all good. Menus are easy to navigate.
Online: This is where it slips up a bit...If you lose connection online it counts it as a loss. This is very frustrating, especially when you were winning 3-0 GRRR! Ultimate team is good but they do seem to try and rake the money in as much as they can. I really don't like this side of it. Head to head seasons is great (a mode in which you have to try and get to division 1 by getting 16 points from 10 games in each division). Friendly matches and 11v11 team games are also great fun!
Offline: I personally feel that manager mode has been improved greatly from previous years. The money issues of previous years also seem better...