Graphics are quite good for a free game. Some of the items have odd pictures in your inventory, and a lot of the sprites for items on the ground repeat.
Gameplay is awesome. Not as much variety in monsters as there could be, but the ability to fly on a broomstick or hoverboard is very unique! There will probably be more monsters added as the beta continues, and after the beta.
The community is great. Almost everybody there is friendly. Of course, you have a few rotten apples, but overall the people are great.
Surprisingly good for a beta. The music can be a bit obnoxious after a while, but it turns off after looping a few times if you are not fighting a monster.
Flyff is a very fun game. One of the few problems is that it is not translated well. You will see a lot of phrases such as “You are become stronger.” But, that is a small price to pay for such a great game.