Gameplay is the mechanics of the game and the mechanics are always very simplistic at the end of the day. Halo, CoD:MW2, et al, pretty much have identical gameplay. What separates them is the story. Fighting particular monsters or particular bosses comes under the story.
Since any gameplay can be reduced to "repeating the same combinations", not really a valid point. Playing football is kicking a ball, tennis is hitting it with a racket, all within a framework of rules, there isn't much in 'options'. So in Fifa, the whole passing the ball, the statistics, etc are part of the game play, the fact you are in Munich stadium and your striker is Wayne Rooney is on the story side of things.
The difference would be closer in Rockband where the 'story' part is pretty much the music, where your characters are located, may it be a pirate ship or bar and the gameplay is the pressing the keys in the right order, and getting bonuses for doing so.
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