I could go on and on, but I'll try to sum it up in 2 things
1) it is one of the very few movies which, after repeated watchings, you still see the characters and not the actors. i.e. Joel Barish becomes Jim Carrey after about 5 viewings
2) The way its put together. The acting, sets, lighting,direction, script, music etc all comes together flawlessly. You couldnt ask for a better picture.

If winners never lose, well, then a loser sure can sing the blues.