5 = My favorite anime.
4.5 = Still in my top ten.
4 = Very good, but with some problems.
3.5 = Very good, but with some significant problems.
3 = Good. Some major problems, but still entertaining.
2.5 = Good enough that I didn't regret watching.
2 = Mih on whether it was worth watching.
1.5 = Pretty bad, could barely get through.
1 = wasted my time.
0.5 = Terrible.