Hello, Welcome to myanimelist. I don't rate season 2s, as the points are incorporated into season 1.
This is how I rate Anime:
10) These are Perfect animes that not were not only enjoyable, and mistakes were not too obvious.
9) Execellent animes with Only 1 or 2 obvious mistakes or faults.
8) Wonderful animes with Slight Mistakes.
7) These are Great animes, It was fun watching them, but theres a few mistakes they need to fix.
6) These are Good animes, I enjoyed them, but there is quite a lot of room to improve them for me to rate a 7.
5) These animes are decent, not half bad. But I didn't enjoyed them fully.
4) These animes are below then average. Didn't enjoy them.
3) These animes are bad. Consider dropping it.
2) These animes are Horrible. Definitely consider dropping it.
1) These animes are pure trash. Ignore it. Life shouldn't be wasted on them.