Again, I find myself disagreeing from you. I think you have a bit of outdated view about games. When talking about games in the Atari-NES eras I agree. Games back then were about reaching the end of an obstacle course. But ever since the SNES the graphics and the input devices have become better and more diverse, that view has drastically changed. I won't deny that there is not an part that is about risk and reward, but it is actually just as important to a game these days as the reward of getting the extras for buying the DVD of a movie.
Developers try to give gamers a more immersive experience with photo-realistic graphics, surround sound and active input. It is not just about reaching the end of an obstacle course anymore. It has become more like experiencing the adventures with the main characters and involving yourself with the characters. I think that games these days elicit more of an emotional response and mental involvement, because of the interactive element. Games aren't really designed for winning and losing anymore, but about involving the player in a virtual world.
The Wii Sports games are a nice example of that because there is not really anything to win only to experience, even with the simple graphics. Zelda, Final Fantasy, Resident Evil, Mario, Jak & Daxter are also such games that try to immerse the player. Like Mammy has said before there is very little difference between movies and games besides the interactive element.