Recently started playing Arbiter, as he was one of 3 characters that lured me to KI and alas I think it’s time to play those 3 unto their 50th level. I am Character Crisis, the Man.
RE: OP, I think Arby’s “low tier” status is a result of some severe overnerfing. Yes, launch Arby had some over-9000 junk, but I think a lot of nerfing happens to assuage relentless crying from the community, so things like hella nerf-bat happen to Arby and Gargos and pretty much anyone that isn’t ARIA that Sleep plays (and I have to assume ARIA hasn’t been utterly disassembled because so few play her and the team thinks everyone plays her wrong).
That said, I don’t think he’s been nerfed to the point of no return. He feels awful strong, and his most potent elements of his toolset is incredibly interesting for a fighting game character: human psychology. He is at his best when you can convince the opponent that they are helpless, though they won’t often truly be. It’s pretty darned cool, but the sort of thing that sticks in people’s craw, ya know?
RE: Arby’s AA suite - one of the things I’m really enjoying about Arby is his wide variety of AA’s, as my most played character is Mira and dear lord I hit maybe one AA per match, if I’m lucky (or if I burn INSX freeze). Yeah, most of Arby’s AA’s require a guess on our part, but we aren’t lacking for options - st.HP also works at certain ranges, particularly when their back is to the corner. My one major gripe is that d.3P (face 'nade) doesn’t recap - it costs a resource, damages us, and isn’t even throw invincible, can it please function like his other grenades?
I also have to agree w/ @SonicDolphin117 that it would be a lil’ more intuitive (and a lil’ less risky feeling ) if his gun-stock moves required a “back” directional (as in the rear end of the gun) as opposed to a “fwd” (as in the front part of the gun that shoots bullets).
None of that makes him bad in any way, and he’s hella fun to play, tiers be damned.