If you like RTS games, it's probably worth 17 dollars. It has 4-5 decent hours of gaming. Problem is that RW is to the RTS what DoC was to the FPS: clearly the first time this team has tried to make a game in the genre, and they are developing it as though the western gems of the genre didn't exist. In other words, they make a number of design mistakes that the west has long ago solved.
Again: worth 17 bucks, give or take. Completely useless if your hope was to get more out of the FFXII story though; it's definitely not worthy as a narrative sequel. It's super shoe-horned in to the setting of the previous game.