I like some other prog-metal, but I'm VERY PICKY when it comes to that genre. DT is the best, by and far. It's their compostions, writing style, playing talent, and everything in between that just makes it all work. I think it's also because they only take influence from a few classic metal and thrash metal bands, and more from prog bands like Yes, Rush, King Crimson, etc. I like LTE, Haken, Riverside, Planet X, and Derek Sherinian's solo stuff just fine, but it doesn't come close to the greatness of DT. Other bands have great albums, but are also way too inconsistent, like Pain of Salvation, Symphony X, Opeth, INDUKTI, Fates Warning, Devin Townsend, Buckethead, etc. And some are plain DT-clones, of which I'm not going to take time to type up examples. So yea, Dream Theater is the best.