1-STM. Not perfect and with a stupid ending, but a lot of great moments and a ton of heart. It's flawed but when it works, it works. The last act is taken directly from Action Comics #5, making it the most faithful adaptation of any Siegel and Shuster original material in the series. 4 1/2 stars.
2-Superman II-many of the same problems as it's predecessor, but also many of the same strengths. Fantastic effects for the time that still hold up nicely and the first real superhero battle brought to life. Great movie with some issues. Acting is great as always. General Zod only matters because of this movie. He was a second stringer before this. 4 1/2 stars.
3-Superman III-It's a hot mess of a movie that still manages to be great in places. A lot of inspired scenes, a lot of great acting, and the epic battle in the junkyard between Superman and Clark due to effects of synthetic Kryptonite that behaves like Red K. Take out a lot of Dick Lester's silliness and this could be a good movie. A nice fan edit of it cutting out as much camp and unneeded sideplots as possible would help. 3 1/2 stars.
4-Superman Returns-A good idea that was just badly executed. There's some serious acting issues, there's some badly chosen storylines, but there is enough in it that actually feels like Superman to make it watchable at times. 2 1/2 stars.
5-Superman IV-Another Superman movie with potential, this time stopped by a low budget and a poor director choice. Would have liked to have seen Christopher Reeve direct this himself with a good budget. It's hard to watch due to the B movieness of it, but at least it has the classic cast and they all do well. 2 stars.
6-Man of Steel-I have blasted this movie over and over, no reason to rehash my thoughts on it. 1 star.
Honorable Mention: Superman VS The Mole Men, theatrically released film, later aired as a two parter of the Adventures of Superman TV series. This is actually the only Superman film with no major flaws, and it has a very welcome and classic Superman message about tolerance. 3 1/2 stars.