I rate things from 1-5 because I am not a big fan of the 10-point system MAL uses by default, so my ratings are not actually as low as they initially appear. A quick summary of how I rate things:
No rating - I did not rate it. My thoughts on it can be found in the tags, but for whatever reason I don't feel comfortable giving it a number rating.
1 - Plain bad. Don't watch.
2 - Not very enjoyable. Has redeemable qualities but overall not a great watch.
3 - The middle of the road. It wasn't bad - I generally don't feel like I've wasted my time but I may or may not recommend it to others, depending on the contents of the work.
4 - Good, enjoyable, fun. A worthwhile watch and would probably recommend to others.
5 - Great. Doesn't have to be perfect, but as long as I thoroughly enjoyed it and think it was a well-made work then a 5 may be in order.
Finally, ratings in any section besides my "completed" section refer to my watch priority, not an actual rating. Also, I'll leave how hard I found the language difficulty in the "comments" section for each show.