I admit my viewpoint on this is biased because I *prefer* all the tinkering he made. I like the special editions better than the originals, the PT better than the OT, etc. (The only thing I don't like is the Greedo scene - not that I could give two shits whether or not Han shot first, but the revised scene is simply badly edited on the face of it.)
So I guess I can understand why Lucas haters pile it on extra vile. Not just because they're jealous of him, but he denied them their preferred version. If somebody fucked around with, say, 2001, and didn't make its theatrical cut available, I might feel the same way.