As far as the benefit of the rest of Magic is concerned, gold cards in Legends were executed perfectly. They got all the excitement a designer could hope out of a splashy new mechanic without using up any of the valuable design space. Truly amazing.
--Aaron Forsythe's Random Card Comment on Kei Takahashi
Pretty good main article, but the Letter of the Week points out why I consider the Eldrazi to have been a D+ or C- on the flavor grading scale - they're pretty cool, but they could have been an A++ if they'd been handled correctly, and it's sad that something this potentially awesome wasn't pushed as hard as planeswalkers were to make sure they came out living up to all the epicness they were capable of. The Eldrazi are supposed to be "Cthulhu meets Galactus", but while Cthulhu is alien and incomprehensible, Galactus is not so much - he was once just a guy, and while he lived through the end of a universe and thus has a rather foreign perspective compared to people who aren't about five billion years old, he's still a lot more human and relatable than Cthulhu. And the flavor text written for the Eldrazi, as well as their portrayal in the novels, makes them seem a lot less enigmatic than they were maybe intended to be. (I will speak more on this later.)
Rise of the Eldrazi has few legends (and even fewer planeswalkers)
Looking forward to it. I think Doug's explaination confuses the matter too much and I am starting to dislike the eldrazi concept as a result. I hate when the explaination is "you can't understand it"