1 - Not sure about euro servers but there are alot of people that play this game. Its still a work in progress but im having loads of fun with it.
2 - There IS grind but thats optional really. Also depends on how many classes you make on one character since you can only do the quest once.
3 - I honestly think the pvp right now sucks unless you have a good team to play with.
4 - Economy is pretty bad with the housing system and RMTs and such. If you are a buyer then you will be happy since stuff is cheap.
5 - Havent gotten too far into end game but so far its intense. Of course if you are a hardcore player and memorize the scripted fights then its easy mode.
6 - Server issues depends on where you live and such. I live in east coast US and i have 0 delay on dodging, while my friend is in mid west US and he has a bit of a delay.

I hope this helps and hope that some people will respond with better info than what i have haha.