Requiem IMHO is the best by far:
It is the only player made movie from any game yet that really stirred my emotions. Other films tell a story, too, but this one's got a message! None ever touched me as much as Requiem did (and still does): where other films tell their story about honor and duty and sacrifice in a rather mainstream way (always with a happy-end), this one clip shows the bitter side of it and really makes you think...
A good movie needs more than nice graphics and sound and a happy-end. There are lots of good player made movies, no doubt, but they're competing mainly with focus on cinematics and sound (and I'll admit that Requiem in fact features the absolutely worst version of the Ave Maria of all times) - not the message.
Requiem IMHO yet has to be surpassed!