Originally Posted by CountChocula 
I wouldn't exactly call the USKP a "fan patch," although essentially that's what it is.
It fixes thousands of bugs and glitches, some which have a big impact on gameplay.
I'm glad that there are people out there who have the ability to fix bugs - god knows I'm a huge fan of those who patched up Gothic 3.
But I can't bring myself to use fan made patches for a game that is still being patched by the developer. It's just too much of a pain in the ass for me to keep track of all the moving parts between the developer and the fans that may play out for a long number of months - most of which I'm busy with real life things and can't keep track of day to day.
But when Bethesda is totally finished with Skyrim - patches, DLCs, expansions and whatnot - that's when I'd like to apply a fan made patch to fix whatever is left that was not fixed by the developer.