What is the most popular video game out today

I can't help you with that but if your wanting to play with a ton of people you can get Call of Duty Modern Warfare 2.

PS. It might also be the most popular game out now.

I do agree but I have been hearing around that black ops is about to beat it and when MW3 comes out it will be the most popular game but if u want to play with alot of people MW2 and black ops are your best bet.