NF kicks ass.
Adding heroes was a smart move by ArenaNet - since essentially they have created a whole new class of money sink (since you not only want to get the best stuff for yourself, but you also want your heroes to have kickass gear).
Coming from Prophecies, I like the new materials storage option and I also dig being able to use some of my Prophecies green collection in NF.
Obviously inscriptions means that I'll eventually end up using all NF greens, but I haven't progressed far enough yet for green drops
Oh, and the Master level quests are a nice addition to a PvE player like myself.