I really don't like signatures. It's only a matter of time until I finally disable them. If I were given the choice between Wario Land or MGS, I'm definitely going with Wario Land, as well. (That's not even taking Warioware into consideration which I also adore.)
Besides, I see Snake everywhere except PC. But that's because most of PC play Pokemon only, popular Nintendo games only or recent big AAA games only. MGS is none.
EDIT: I'm actually wearing that same Snake avatar in Youtube. And a Big Boss avatar in both Twitter and Facebook. lol