There are heaps of possible improvements but one thing that could use improvement, and easily is stats accuracy.

Rodney So'oialo is a no8 or flanker. not a no8 or lock/second Row as they have it for his second position

France should have Michalak and Jauzion as Stars. Someone in their backline should have pace of over 85 apart from a that one wing at the bottom of their squad. their real life backs are brilliant, on the game they are slow and have generally low stats. they are the second or third best team in the world.  their stats should reflect this

there are more stats errors but they are the ones that bug me