After trying out FIFA 09 and FIFA 10 on the PC I was terribly disappointed, so much so that I have uninstalled both and reverted back to FIFA 06. I haven't reviewed the most recent versions, although the opinions of others for those versions echo my sentiments exactly.
On to FIFA 06, and for the record this was actually a very good version. The gameplay was free-flowing, offside decisions weren't always correct (which is realistic), and direct and indirect free-kicks were much better.
Certain things did bug me though. Firstly, where on earth is Fabio Aurelio? Nowhere to be seen at Valencia, and it wasn't as if he was an unknown youngster at the time. Secondly, there is a particular glitch on the game. What happens is that from time to time I've been awarded goals when one of my attackers has headed a chance just wide, and I'm definitely not seeing things - the replays confirm it. But again I suppose that could be classed as realistic considering incidents in recent years at Vicarage Road and Ashton Gate, I'm sure Neil Warnock will agree.
Aside from that there's not much wrong with this version, although if you want to experience FIFA to the full just stick to the XBOX 360, preferably with an HD telly.