The Unofficial Patch is a combination of the default Basic Patch which mostly fixes bugs only, and the optional Plus Patch, which is kind of a mod adding various tweaks and implementing a lot of unused content, including new quests, levels, weapons, items, characters, dialogue, graphics, models, sounds and original music! Included are also the optional Patch Extras which feature Player Mods, like shaders suites, as well as Developer Tools, like the Unofficial SDK to mod the game.
Shouldn't even be called the "unofficial" patch. It should be called "the only way to play this game" patch. Hell it really should be the official patch. The fact that this game was near unplayable, unintuitive, missing content, and mechanically weak at launch should completely disappear from everyone's mind. This patch simply makes the game what it always should have been. A unique gem, a masterpiece of the medium that will be loved for decades and decades. Thank you Troika and thank you wesp along with everyone that helped him out.