Board Thread:Metal Gear Solid V/@comment-109.193.182.64-20150922080055/@comment-90.222.84.156-20151109221811

Kojima himself mentioned that REX's appearance was tailored to fit the graphical limitations of what the PS1 could handle. Like others have said, if MGS1 had been released on the PS4 REX almost certainly would not have looked the way it does and would be far more impressive.

Also as others have said, REX can be controlled manually and within a VR environment, it can launch a nuke to-and-from any point on the globe undetectably, it beats RAY despite being heavily damaged and without its railgun and radome - even though RAY was apparently specifically designed to beat REX. Whichever way you look at it, REX is the ultimate Metal Gear.