Where to start?
1. The whole "End Game" thing is not a good thing, you should go to a persistant format with many quest lines after the current one.
2, The group instance stuff sucks. I am ready to stop playing completely because I can not proceed in a quest line without that group crap. (Trying really hard not to use profanity here, but I seriously despise the group stuff). If you have to have that kind of ignorant garbage then do it in a mini game format that does not affect the actual gameplay of those that do not want to do it.
3. The limited content within the professions makes grinding actually worse as there isn;t as much change in scenery or even what you are making. Fishing is still fishing, but with 50 different kinds of fish it isn't as monotonous.
4. Scoring? The inconsistency of the point system is ridiculous. How many points that you get from doing something should be constant regardless of your level.
5. Using the mini map to get around is as best frustrating since the cursor point is not what registers when you click the mini map. The map should be slightly larger and much, much more accurate with the cursor.
6. The constant turning of the game play area when the player does not turn it themselves is iritating. The removal of the option to change what way the arrow keys rotate the game was also a very bad move as the backwards stuff makes me want to punch someone in the nose.
7. Having things take up more than one space in the inventory is just way too obvious as to your motives. Not to mention that it just looks stupid. If you are having trouble seeing what something looks like in the inventory then a simple mouse over should get you a pop up window with a larger picture like they do in most games.
8. Quest levels that are off. There are a lot of your quests that are very easy combat for the level of the quest and there are some that are almost immpossible at the level of the quest. There is just way too much inconsistency.
9. I could do without the whole armor and weapons durability stuff, but that is not a deal breaker as it does happen in other games as well. It is just more of a pain in the rear.
10. When someone clicks on the World map icon, they should get the World map. That means the entire world map. Different maps should be accessible from within the world map screen.