Martin is the most realistic of the group. He has no qualms about allowing his characters to enter situations in which they can't escape - and they don't. His books have the least amount of "magic" in them, making them almost a medieval history tale rather than a fantasy series.
Goodkind is the most idealistic. Every book has a tangible beginning, middle, and end. When you finish a book in the series, you are satisfied, but ready for the next one. He does have a habit of placing his characters . . . well, mainly the main character . . . in seemingly unescapable situations, and always provides a deus ex machina for him to get out of the jam. But it works, and as of late, Goodkind has been less loath to show the very real human consequences of a massive war, killing several important sub-characters.
Jordan suffers from, as Stephen King so aptly put it, "diahrea of the word processor." He can't get to the damn point. There's been one major plot point resolution in the last 4 books of his 10-book monstrosity, and I've washed my hands of it. I'm waiting until he kicks the bucket and Tor hires a ghost writer to wrap things up, or until he finally takes some Mylanta and gets down to business.