So far The main story is better then I thought it was going to be. Everything with Doom and Strange was awesome, now with Reed back in the picture it's only a matter a time before he finds out what Doom did to Sue and his kids.
Dont say its not worth it, when you can sleep with no fear, that kind of time is worth any thing.- FFX
I do like the main story. It's very much a Hickman slow-burn story.
Some of the other side stories are fun too, lots of "what if?" style stuff. It's interesting to see that in a lot of those domains people are starting to suspect something's wrong. But if you try to read too much it can get very confusing trying to keep track which version is alive in which part of the world and what they are up to there.
Personally I loved the "last days.." books too. The Black Widow book has been one of my favorites the last few years (good story, great art) and the final issue where she basically reflects on who she is now and who she was is very good, though rather brutal.
I got Blackest Night and all of the Green Lantern issues this week. Its amazing how well they all come together. If anything this might be the most tied together crossover of all time. I was stunned by Sinestro becoming the White Lantern.