All based on my personal enjoyment of the series whether the story was good or bad. These are my views on overall likeness of the series. I usually don't hate anything. I just like some things more than others and try to enjoy each anime as much as I can.
5 - My abundant amount of Mecha Unicorns. Everyone must see these... or not, it's whatevs.
4.5 - Loved every minute of it. Minor problems can be completely disregarded.
4 - Fantastic. Would recommend to almost anybody.
3.5 - Enjoyed it. Only recommend to fans of the genre.
3 - I liked it. It served its purpose.
<3 - It was okay. Can be forgotten about.