I started watching anime seriously in the summer of '08 and in the past 3 years it's become one of my main hobbies.
My rating system:
10- LOVED it, made me cry or just kicked serious ass!
9 -Really awesome, but didn't have enough to put it over the top (bad ending, annoying character, stupid fillers, too much ECCHI)
8- Fun to watch, thoroughly enjoyed it
7- Meh... didn't really leave any impact good or bad
6- Some good qualities, but had a lot of things I didn't like
5- Hard to get through
4(my lowest so far)- Shit... barely suffered through it, would never recommend it and never want to see it on my computer screen again
3-1- Never had to rank so low, thankfully