The thing that makes GTA alright is that you spend most of the mission time in your car, which controls great and when you are on foot in combat sections you have auto aim. Its fine. Its not a precision shooter. The game doesnt rely on getting headshots.
I admit that running is weird though. Im not sure why its so iffy. I feel like they try to make it more realistic, but comes off as janky. Its been that way since GTA4/RDR.
I don't even think the cars feel good, since the fact that hitting something causes you to come to a complete stop, which is realistic sure, but its not fun. Its not enjoyable getting killed in a chase because you hit another car, and the cops just fucking shoot at you while you try to recover and die.
And as you said, the actual act of making your character move feels bad. The auto aim shooting feels bad because making your character move feels bad.
And then you have the main missions which are a fire and forget collection of mechanics that will never actually have any bearing on the main game. So you have a game that is a collection of nothing mechanics and the actual core feels awful to use.
Interacting with GTAV and MP3 was never enjoyable to me. It felt awful most of the time, and tolerable at some.
The only game I think felt ok was RDR, because the horse controls worked great, the fact the semi automatic weapons was the majority of the arsenal you and the enemies had access too, and the fact that world was actually engaging and was filled with characters who didn't feel like shit caricatures that I wanted nothing to do with helped it a lot.
Like, people give ubi shit for repeating the same mechanics, but at least they feel good to interact with.