Dungeons - Who couldn't agree that these are awesome? Good loot, plenty of chests, easy title earning and experience, aswell as a quest with extra bonuses of money, experience and rep points.
Titles - Yeah, I know -everyone seems to be complaining about these. Why? They are so easy to get. All you need to do is go through a map and you earn 2000+ points, not like in NF at all - stop complaining just because you need to put a bit more effort into armor that you don't even need.
New weapon skins - These look awesome, good job on them A-Net. I especially like the daggers.
Minigames - Stuff like the Norn Tournament, Kilroy's quests etc etc make the game a lot more interesting, people who say "i hav noffin 2 do i am 1337 i alrdy finshd teh gamez" obviously haven't thought it through

Landscapes and maps - These are beautiful, and gigantic. I can spend hours going through a map killing and earning title points without any trouble.
Quests - They are a lot more compelling and interesting than any of the previous games.
The Gwen easter eggs - Bringing Gwen to Underworld and learning all about it was good fun, a nice added extra.
Neutral
HoM - Personally, I don't really have complaints about it, it does just what it's meant to do and people are fussing too much over it. Although, it would be more handy if it was account based instead of character based.
Armor - They're all basically re-skins, pretty boring. But then again, fancy looking armor isn't necessary.
Cons
Chests - I spend 15k on lockpicks and get 30 purples or something, that isn't all that good. =\
Vekk - His voice doesn't suit a rastafarian midgit.
Chromatic Drakes - For level 20's these things sure know how to kill me. Maybe you should dumb them down a little, Anet.
That's all I got, overall I think this new expansion is great, there are a couple of things that need a little tweaking, but they're fairly ignorable.
Good job :]