Parokki on 02 April 2009
Quality is debatable, but the Halo series has been vastly more influencial. It's one of the biggest reasons that the Xboxes have been as succesful as they have, and has had a huge impact on how console FPS games are played.
Metal Gear Solid might be unique, but that's not the same as influencial. Relatively few games have copied it, and it certainly can't claim to be an important part of the success of the Playstations. One might argue that the genre of stealth games owes a lot to it, but it came virtually simultaneously with Thief, and has since been surpassed in gameplay by a horde of other games.
