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.
This is the way the game should have been from the beginning. And the hard work that Wesp put into such a patch has to be repayed with a 10/10
why does the review need more than 150 words? Damn, it's an unofficial patch that fixes all the bugs in the game you stupid computer asking me what is this and to make a larger review. Are you satisfied now?