5 Star = Excellent. It went beyond my expectations.
4 Star = Good. However, not the best I've seen. Still recommended.
3 Star = Average. It's formula, but if you like that type...
2 Star = Poor. Not only is it formula, it's formula to the point of boring.
1 Star = Unwatchable. It's terrible! Doesn't get any point across, totally random, no plot (and there was supposed to be one), doesn't make any sense beyond the fact it's animated.