The graphics do suck, but that just adds to the game's undeniable charm. Although I think it's appeal is definitely geared toward an older demographic given many obscure references to the 1980s. One thing to do, and you can find it in a faq online, is to obtain the cell phone early, which acts as a fast travel device within the game. Having this one item is huge in terms of improving the game's playability.
All in all, for a mature gamer not dependent on graphical eye candy to enjoy a game, this is definitely worth $13.