Ultimately I see it as a refinement of the GW experience, taking that which was great in Guild Wars and merging it with elements that other games have capitalized on.
- Amazing Graphics/Art Style. The animations and landscapes are incredible.
- Primary/Secondary class system allow you to tailor a character to fulfill the exact role your wish. Damage, healing, support, and everything in between you can set the amount of each you want depending on your class selection.
- Wide range of skills combined with limited skill slots make for great game mechanics and present an interesting "opportunity cost" system when choosing skills.
- The missions. They are scripted well and are extremely immersive. Major highlight here that I haven't seen done(or done well at least...) in any other game.
- Ultimately a combat focused game. No crafting professions or excessive roleplaying features to weigh the game down. They keep their focus on combat interactions and it shows.
Combine these amazing attributes with some of the things (I believe) the game lacks...
- Not having Persistent explorable areas really makes the game feel somewhat barren. While the scenery is beautiful I can't help but feel it's a land uninhabited with relatively few friendlies around. Thankfully they're making the explorable areas persistent in GW2
- Character control compared to other games feels quite sluggish. The inability to jump, roam, and simply control your character in the ways you would expect is lacking. GW2 supposedly won't make you feel your character is on an RC track :P Another welcome change.
- Level cap. Too low. I like the idea of a much higher (if not infinite) level cap. Progression Progression Progression.
The pros far outweigh the cons, and really they're changing my only three cons. Build on the core of a very solid game some features to enhance the feel and longevity of an otherwise mechanically sound game. What more could I ask for? GW2 sounds like it's shaping up to be great. Too bad it's such a long ways off :P