I bought a Marvel Unlimited subscription a while back and it's been great. I've been using it in part to follow along with the Rachel & Miles X-Plain The X-Men podcast, which you should listen to because it's great, but in addition to that...
Mark Waid's Daredevil: Speaking of the solid author in question, his DD run is absolutely as good as advertised - smart, fun, often poignant writing with gorgeous art. It's very much not your usual Frank Miller-ish noir Daredevil, but it works really well as a deliberate contrast to the last 30 years of the character.
Grant Morrison's X-Men: Man, I have conflicting feelings about this one. The story is, on the whole, really good. It's got a great take on the whole mutants-as-subculture issue that gives many writers fits, I kind of love the Weapon Plus retcon, and the new characters introduced are pretty great. The swerves from big-picture sci-fi to mutant counterculture and a murder mystery are well done. On the other hand, while Morrison's usual philosophical weirdness is toned down somewhat, even that level of it strikes me as an ill fit for the X-Men or even the Marvel Universe in general -- on the other other hand, I'm not sure how much of that reaction comes from identifying Morrison-ness with the DC universe because that's where I'm familiar with his superhero stories from. The art varies from “pretty good” to “total crap.” And, of course, the big negative is his use of Magneto, which has so many problems. Either he's acting out-of-character as hell, or he was meant to go out as the mind-controlled lackey of a new villain (and I like Sublime, don't get me wrong – it's the best possible intersection of that Grant Morrison high concept craziness and the superhero side of the X-Men), which is just not a good way to deal with that character. I'm glad it was retconned, even if the way they actually did it was clunky as hell.