I wonder what it tastes like
Have you seen all the hilarious new pics and movies of Snake's appearance in Smash Bros Brawl? I can't believe how accurately, or for that matter, how extensively, they are adapting the source material into the game. They really seem to be going the extra mile to fulfill every ounce of potential that the concept of a Metal Gear/Smash Bros mashup presents... even if that means letting Snake talk about eating Yoshi.
It's certainly a much more satisfying way to do a crossover than just shoving the characters' models into a pre-existing game template and ignoring almost everything else about them and their respective franchises.