MGS' second boss fight takes place in a snowfield as Snake faces off against Vulcan Raven, who happens to be controlling a tank. The reason this one ranks so low is that it's both extremely easy and tedious too: there's not much more to the boss fight than hurling a few grenades on top of the tank and avoiding the gunfire. As long as you can recognise basic attack patterns, this one's a cakewalk and feels extremely old school given the game's sophistication in other areas. It's such a low-effort encounter that it scarcely feels like a boss fight, but there you go. Plus, just like the Sniper Wolf battle, it pales massively in comparison to the later fight you have against Raven.