I watch anime as a side hobby after work. My perpetual goal is to find a series I will enjoy more than whatever my current favorite is. At the same time, I'm fond of viewing the "classics" so I can better understand where other viewers are coming from. This site seems like a good place to keep track of it all.
A self-guide to my ratings so I'm internally consistent:
5 = My favorite anime ever.
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 = Bad, wasted my time.
0.5 = Oh gawd, kill me now.