1. Pvp, is not for the faint. But I love it. Also from look at Ktera's site expect large changes to Pvp combat (all of these changes looking AWESOME)
2. End game looks to have better variety than your standard MMO and with the addition of warzones in the summer, There will only be more to do, Also you have Queen of Argon part 2 coming. (next huge patch)
3. The game's SUPER easy to lvl up, until about 40 it starts to take a steep curve, But in no way is it a grind when your doing dungeons and questing. No Aion grind or Lineage grind.
4. The game does have bugs, but what MMO doesn't you should take bugs with a grain of salt, especially until ATI/Nvidia get some drivers out over here. Although the game plays smoothly on the majority of all systems without new drivers and i hardly ever see anything buggy outside the random shadow glitches every once in a great moon.
So there's my answer for you. It's an incredible game. Really makes you wanna take your hat off and applaud Korea. Because this really shows how they can make a badass MMO without any of that generic redone Korean grindfest style gameplay you see in almost all of them.