EA says in FIFA2000 that players has different body types and heights, however, what I see players in the game are of similar body structure-tall and thin. Do you notice there is any difference in body structures amongst players?

Yes I also noted this. It is hard to tell the heights and only the goalkeepers seem to be more muscular than the other players.

EA promised to have players of different body heights when they were making FIFA 99, but that didn't happen. Same thing this year I guess.

I've notticed different player's height, specially in the movie-sequences (when the game ends or when u score a goal) In fifa 99 i also notest different heights, you can prove it editing 2 players with FEd99(one with maximum height=15 and the other with 0)when they make the kickoff you'll clearly see the difference.