The other blog posts about the Ultimate Game have all been small details that enhance the game but the main idea that makes or breaks the game is the gameplay itself. You can have the coolest sounding game and the coolest sword peripheralbut if all you have to do is swing it back and forth to make it through the entire game, it's going to get bland fast. Many action games have fallen into the bland category with intricate combos you can pull on your enemies and flip around and look cool but in the end you can just click "A" three times for the basic punch-punch-kick combo and beat every opponent you come across. Other games become one sided because of a special move or powers your character can do like slowing down time, super powers or curving bullets. Ultimately ending in boring gameplay after the second level. If done right these player enhancements can be done right. Crysis gives the players enhanced abilities like super strength, cloak and speed. The game has set limits on each of these powers so the player can't exploit it and use them entirely through the game. I also have hopes for the upcoming Wanted game with curving bullets. It seems overpowered to do so but I have heard from developer diaries the player will only have a set amount of times they can curve bullets limiting it like Crysis did for it's enhanced powers. So here's to hoping after the 100th time curving a bullet it won't get boring.
Some games have been known to try and sell a game on licensing for a superhero and make it look totally awesome but if all you are really doing is flying through rings in the air as Superman no one is really going to feel as cool as him (Superman 64). In most Spiderman games, swinging around may be really fun but when it gets down and dirty fighting enemies it becomes very clunky almost as if the developers focused most of their attention on the freedom of swinging around. Gameplay brings everything together to hopefully make the best game you've ever played. It's important to keep the level of difficulty maintained, the player engrossed in the story and combat so it's new and exciting for the player each time.