A lot of Real stadiums to choose from.

Seperating home and away crowds ,there chants, colours, cheers, etc.

Dug out, linesman, officials, stewards, medics and maybe a speaker like NHL 2000.

More realistic (AI) commentary.
22 players per team.

A realistic transfer system.

A larger field.

More in-game celebrations

Earning money with sponsering and supporters, this money can be useful for buying players.

More management into the game.

Players should be able to be in shape or out of shape (hot streak/cold streak).
Players could be injured for longer time, show the injury of the player.

Smoother gameplay.

Players could be fighting with eachother ( more bodycontact).

More cups.

Realistic results and different types of play by different countrys

A lot more divisions must be included.

Realistic cup-winners league-winners, for example: Watford is playong against relegation, not Manchester United, or Arsenal. The top teams from each country must be top teams. ( I hope you understand).

More movies, sounds, commentary, etc.

Sorry for my English, I am a simple Dutchman and my english is not so good, I hope you'll understand!!!!

The goalkeepers must be smarther.
The must leave the goalline to punsh a cross away.

More AI gameplay, more emotions and frustrations.

Shooting must be a lot harder, in FIFA 2000 you can't blast the ball wide.

Better set-pieces.

(sorry for the English again)