Certainly this is the best FIFA ever, probably the best football game as a whole... However, issues make the difference!
You must be asking "why does this guy give 7.5 points and comes here saying this is the best footballer ever?"...
I'll tell you...
Fifa 10 has a glitch, a major glitch for hard players on Manager Mode. After some seasons, while changing clubs or re-signing contracts, you might have some billions of negative budgets, ruining all your career till then! This is a known glitch - I found that after it happened to me - and EA doesn't seem to have a fix for it after so much time.
I was 10 years into the game, making my way from a bottom team to Real Madrid. It is frustrating that this issue actually exists... It seems like the 90's or something. Unreal!
The bottomline remains that FIFA 10 is an excellent acquisition. This is an issue that has ways you can avoid it (but these are annoying such as creating multiple save game files and then loading them until you can load it normally)! It is also an error that you will only spot after a while playing it but you have to admit it is an unadmissable glitch for a company such as EA.
Hope this helps and I really tried to overcome all my frustration in writing these words. I've played this game more than any other in my whole life and loved it... But surely now I'm going to pick up the PES 2010 (that I've tried once and then put it aside) from the shelf and give it a chance until something new pops out.