That's true about Prophecy, but The Dark has only two cards that have stood the test of time: Ball Lightning and Maze of Ith. Those are both quite good, but the rest of the set is almost all crap (there is an important exception here or there, like Tormod's Crypt). Prophecy has a few cards that are extremely bad and most of the rest is just okay. Some of them are quite good: Chimeric Idol, Plague Wind, Despoil, Avatar of Woe, and Spore Frog in particular.
And Legions? It did come in at number four, but still, how can you not despise that set? All creatures, what a terrible idea.
I should definitely not have picked Planeshift, as others didn't seem to think of it. But I would never have guessed some of the others, like Mercadian Masques and Urza's Saga...