I ran through all 60 levels of Neverwinter (solo except for the missions you're forced into a group for which are entirely optional) as a trickster rogue in a little more than a month and had a blast doing it. Didn't spend a single dime on the game either. What drove me away from it was the fact that it has well over a dozen different currencies that are all used for different things and it's not always apparent where to go or what you need to do to get the currency you need for the thing you want. It's a fun F2P game but it may skew too free for it's own good. At no point did I ever feel the temptation to spend any money on it at all.