My uncalled-for ten cents:
Both locations have their plusses and minuses. There are certain attractions I think were done better at Disneyland - Fantasmic!, Pirates of the Caribbean, Space Mountain, Tiki Room (still the original; no irritating Iago, William, Morris, or "Conga"), Buzz Lightyear (removable guns), Haunted Mansion, It's a Small World, Mr. Toad - and some that are better at Disney World - Splash Mountain, Snow White, Jungle Cruise, Tower of Terror (though I don't care for either version, Florida's fifth dimension room makes DCA's look even more pathetic), Star Tours (the outside, anyway). But each has so much to it that makes it unique that comparing the two is futile. Yes, Disneyland is smaller than the Magic Kingdom. Can it be faulted for that? No. Walt couldn't afford to buy more land for it, and everything was snapped up around him once the place became a hit. But it IS the basis for everything you see at Disney World, especially - obviously - the Magic Kingdom. It is a bigger version of Disneyland, true, but attractions and lands have been left out/added to each that the other doesn't have (and though Disneyland is smaller, it still has many more attractions). For example, Disneyland has the amazing New Orleans Square, the Magic Kingdom does not. The Magic Kingdom has Liberty Square, and Disneyland doesn't. So it becomes an apples and oranges type of argument. You can argue which attraction is best at which Park, I think. For instance, there's the obvious Pirates of the Caribbean comparison. Disneyland's floats through a beautiful bayou past a great restaurant, then drops you down two falls to a large cavern area of skeleton-filled scenes. At Disney World, after an admitted cool queue through a fortress, you get one (or two) skeleton scenes, and one quick waterfall. At Disneyland you get a climb back to the real world "up the waterfall," while at the Magic Kingdom you go past the final scene and you're abruptly told to get out and take an escalator back to "ground level." To me, Disneyland's feels much more complete (partly because it's the original), and thus I prefer it to the WDW Reader's Digest version.
As for quality, I think this is a both do/both don't type of argument. When I was last at Disney World in May, I did not notice any quality lacking. In fact, the much-maligned Country Bears operated perfectly, as did The Haunted Mansion. Problems happen. At Disneyland, I sometimes get doombuggies that have poor or no sound. Even though they've recently rehabbed it, it still has its problems. But I also ride it at least twice a month. I'm bound to find a bad one every now and then. I just let the CM know about it, they usually mark it so no one else rides it, and I'm on my way. The more you visit a place, the more problems you're going to find with it.
To those who discount Disneyland because of its surroundings, I think you're also doing it a great disservice. It can't help that it is surrounded by ugliness. To me, it's like an oasis amidst the hideousness of the hotels and motels and 7-11s. It's amazing how you're completely in a different world the moment you pass beneath that berm. I love that about it, just as I love that Disney World is separated from Kissimmee by all those trees. Whether it will stay that way forever is another thing all together.
Added note: You beat me to the punch, Lynx04! How did we manage to write so many similar things at almost exactly the same time?