I just started playing GW again today (stopped for almost 1 year). I quit playing WoW 2 weeks ago and I feel like playing a good MMORPG again. So I decided to install GW again and I'm in love with it again!

I have Prophecies and Factions but now I'm thinking about getting Nightfall too... But, WHY should I get it?
-I really like the PvE in Prophecies which Factions didn't have. Does Nightfall have good PvE too?
-Don't really care about the PvP in Nightfall.