This game is one hell of a nice MMORPG.
Firstly RF online is a MMORPG with the most open selection of weapons iv'e seen in a MMORPG everything from simple swords to laser guns and magic staffs there is bound to be a weapon to suit your style here, and the best bit is no matter what your class, you can use any one you want, though it's recommended to stick with the weapon best required for your class.
Anyway as for classes you have 3 races and 4 base classes and (3 for accentra) each class can specialise in 2 sub professions and 2 more later in the game.
Each race is constantly at war with the others which can add some real fun to the game as you try to survive in often hostile conditions though this can also be very annoying when your trying to do a quest. But since thiers normally a war every day, you can get revenge and have fun doing so.
The environments are lovely looking from rolling hills, vast deserts and robotic bases to dark caves, dungeons and a mixture of them all.
Though RF online is good, but it also has its bad points. The first is the lack of sight in the game, you can see roughly about 150 meters around you which can be incredibly annoying when your trying to avoid certain monsters and the total lack of a world map (there is an area map but not a world map) means alot of exploration and the lack of difference in quests (kill certain number of certain creature) will put off people wanting a good quest orientated game and the musical soundtrack is surprisingly weak, but see through those problems, and your bound to enjoy this game.