On the whole, I'd say NoS raids are easier then the last several expansions, although the last time raids posed any meaningful challenge was TBL. The real issue is, all of these guilds know the raids inside and out before they're released, since they're available for testing in Beta and the Dev posts write ups on the whole event. There's no "who can figure it out faster" factor anymore. Much of it boils down to who can deal with the massive lag and zoning times better, so there's some luck involved. I've personally never understood why guilds still bother with gamewide firsts anymore, but clearly some still care. Given the above, it's all pretty meaningless in my book.