Over 60 international teams are available, and you can take yours through a number of different game types, including playing a one-off friendly or attacking the full World Cup. While these might seem appealing, you're tempted also by the inclusion of the major European and American leagues--15 in all.
The Season option, on the other hand, lets you play up to three consecutive campaigns, with relegation and promotion available in a FIFA game for the first time, and with versions of the UEFA and European Champions Leagues also available.