Most Unplayable Single-Player FPS Masterpieces, Ranked

Before the genre's fundamentals were codified in the early 2000s, FPS games went through their Wild West phase, as developers searched high and low for that elusive control scheme that would unlock shooters. This period produced plenty of fantastic and experimental releases, quite a few of which have aged like milk in the hot summer sun. Don't get me wrong, these classics should still be hailed as masterpieces, but revisiting them nowadays tends to be an exercise in frustration.