Ofcourse it's a good game! (that's my biased opinion ofcourse)
You can check the sticky by Lydiaele, that post gives a great overview of the game and a good comparison with other games.
I haven't a clue about PvP.
I do know that it is going to take me about 11 months to get one character to lvl 70. (only 43% left to go!) But I am truly a slow leveller, and am doing it completely solo. You should ask Bodhisattva how long it took him, he was quite fast in getting to lvl 70.
Grouping is faster, doing tough quests in group is about the best way to get xp and good loot.
I haven't a clue about end content,not there quite yet. I also have never been that big a fan of instances and the likes. But that isn't really needed in this game.
Lots of quests are fun, some were even memorable (Nek Castle access quest to get to Lord Everling is still my favourite). Ofcourse, some quests still hurt me even to think about them.
All in all, the game is the best out there for the moment. For me anyway.