Now, the concept of ranking anime programs via tiers is a pasttime of the people on 4chan. Well, actually, they do it with various types of media, and even people and music. Usually tiers lead to a lot of shitstorms, though, and generally tier threads are (and should be treated as) troll threads. Tier threads are absolutely awful, mostly because the rankings go unexplained and they lack the nuance of a more ordered numbering system. Still, those tier charts are tempting to attempt.
So, with Gundam anime, I've decided to compromise, and try my hand at one of these things, but also provide reason for my decisions as to where to rank each entry. Now, as I have yet to finish watching some of these, or haven't watched one or two for a long while, the list remains "open" to a degree. There's some possibility for mobility, as well as reconsideration for most of what's on here. So keep that in mind when you're reading this.
Tier charts are usually divided into a few different tiers. Here I've divided it into the popular ranks of "God Tier", "High Tier", "Mid Tier", "Low Tier", and "Shit Tier". "God Tier" being the tier in which, in my opinion, the best Gundam anime are in, whereas "Shit Tier" has the worst Gundam has to offer. Since I enjoy ending on a high note, let's begin with the worst of the worst, the Shit Tier.