Reamde starts off with a lot of interesting ideas, and then morphs into quite possibly the worst watered-down, airport-paperback, fourth-rate-Tom-Clancy-triller nonsense I have ever read. Avoid it at all costs. Unbelievable plot and character motives. ick.
If you can suspend disbelief at the sheer ridiculousness of the situation, it's pretty awesome.
Writing aside I've found the plot pretty slow with not much interesting happening for most of the Zula portions (ie. middle half of the book). Maybe Stephenson's level of detail just isn't for me but it really wants for editing.
Anathem and Diamond Age were harder for me because of the depth of ideas. I had to slow down and think to get through them.
Baroque Cycle was harder because of the sheer number of characters with multiple and/or similar names, which is realistic but annoying. There's a list of characters in the back of the first book, which helps, but it's annoying to have to keep the first book handy when you're reading the others.
Stephenson does have a reputation for starting great books and not knowing how to finish them. But I think I've gotten more than my money's worth out of all of them.
The Mongoliad semi-fictional view of mid-thirteenth century Mongol invasion of Europe
Reamde MMO gold farming, social networking, criminal methods of the Russian mafia, Islamic terrorists