Flyff is ok.
The combat system is good, the ability to fly is also good as well as all the skills you can get in each job.
I think that you should get more exp from killing things because it begins to get really boring trying to get to the right level to get the next available job. Fighting monsters gets boring after a while because it is repetitive because all you do is attack it the same way again and again until you level then you repeat the process on higher level monsters.
This game could be better if there were more jobs put on it in between the gap between lvl 15 and lvl 60, if the level required to fly was lowered and you should be able to talk to people on different servers while staying in a different one. You should also be able to transfer you character(s) to a different server as well as all their items and equipment.
My highest lvl character is a mage, lvl 30, i can't be bothered to continue to level up i might be missing out on a lot but quite frankly i don't care.
If the download time for this game was shorter it would have a lot more members because i have lots of friends that wanted to download it but the couldn't be bothered to wait for it to download.
The name flyforfun suggests that they think flying is fun but the only good thing about it is you can travel to places faster. Everything else in the game pretty much sucks.