they aren't like traditional games where u need to remember specific moves or buttons.
Very true. They can relate more to doing the natural movements for a game rather than button mashing. It also adds to the realism and immersion into the game.
Unfortunately that realism comes at an additional cost. And when you want to play multiplayer... *dies*
And then there are the same-genre games that COULD use the same peripherals...but since they're made by different companies, they don't. It really hurts the wallet.

