As you can tell, I've put a fairly large amount of time into RO2. When I first started playing, it was brilliant, and I had a lot of fun. I thought the community was okay, and helped start a guild. Then I realized something - with each subsequent patch, they would break the game, then you would have to wait another month for a new patch to fix the problems, and then it would introduce new ones.
This came to a head after I spent money to support the game (I did love it, and I rarely do this with free to play games) and two days later the new patch came out - That entire month was spent with the game being unplayable. The game doesn't even require a high-end system to play, and I have a fairly high-end system that couldn't handle it after the stupid patch! Wasted money, entirely.
There are redeeming features - cute stylized graphics and fun gameplay, I didn't feel that the character clases were unbalanced as others have said, I think it IS highly taylored to your personal playstyle and like most in-depth MMO's, reading guides will help.
When they decided to switch leveling models at level 50 is when I really stopped enjoying the game altogether. Up to that point, it was great, it was challenging, and it was fun to play. Suddenly, getting to level 50 was something you could do in about 16 hours of gameplay and then every time you died your previous experience would get erased to a degree, causing you to have to grind and grind and grind to get back where you were - to die again. The auction house reflected this with better equipment when reasonably priced equipment became extremely expensive, when it was nearly impossible to sell anything made with the crafting skill you have to develop, and with ridiculous things that you an pretty much only buy for insane amounts of zeny (in game money) or real life money, which quickly gets sucked dry because they do useful things by day, not by number of hours, and you can get part of it for free simply by logging in every day.
What are they thinking?
I stopped playing after the expansion was released and I had several characters up to level 50, it just became a chore to deal with everything. When a game stops being fun, it's time to stop playing and move on.
That being said, you an tell easily that I've put many hours into this game - more than most, less than some. If you're going to play it, prepare for one of the most shameless pay-to-win models you've ever seen. You'll get tired of it quickly, whereas if you had been playing it last year, you'd be having a blast. They won't be getting anymore of my money, and I won't ever get the month of gametime I lost after they broke the game.
In good conscience, I have to advise against playing it. At this point, just stay away, there are other better alternatives with less invasive pay to win models in existence. However, it's worth playing a little bit just to see the pretty world, if you're into graphics that don't require a lot to look very cute.
5/10. Visually high on the list, but after what they pulled on everyone who played it heavily, especially people who thought it was good enough to pay for and then yanking the rug out from underneath of them, they lost any support I would give them. Again, give it a shot, maybe I'm just bitter because I started playing it before they decided to ruin it, but new players may find something to enjoy here.