MGS (and MGS2) are prominent enough, and directly relevant enough, and predate Shadow of the Colossus enough, that not mentioning them is a conspicuous omission, and not just something it would have been nice to add. In fact not mentioning them makes the article somewhat misleading, especially when at the same time it chooses to highlight Spec Ops: The Line.

You really can't mention MSGS without giving due mention to DOOM, which owes its existence to the popularity of Zork. And you can't mention that without D&D, but you have to preface every mention of D&D with historical war board-gaming and... chess and Go.