I used Goodfilms briefly, but the rating system is so bad I stopped. The odd thing is that, as this blog post demonstrates, they recognize the problem and then totally fail to solve it. Ratings tend to be fairly bimodal, with people either liking or disliking stuff and not making fine-grained choices. In response to this, the Goodfilms system makes ratings continuous, so that rather than trying to figure out whether a film is 4 or 5 stars, the user now has to figure out whether it's 3.8 stars or 4.6, then compounds the problem by making the user rate on two separate scales with a pretty opaque distinction. So the response to the observation that people's ratings tend to be simplistic is to make the rating system much more complicated; it's pretty much the exact opposite of a solution (I quite like letterboxd's system, which has five-star ratings and also a "like" button, which gives you some level of choice over how fine-grained you want to make your ratings).