I don't see why it would be called "comically bad" compared to its contemporaries. The 1.x series was a bit spartan, sure. But the UI itself afforded several unique features that weren't found anywhere else. The ability to have multiple "screens" or viewports with independent resolutions and color depths and drag them down to navigate between them seamlessly was quite useful, as was the ability to move windows on top/bottom of the stack without focusing the window (which is largely a forgotten paradigm, outside of forced "always on top" windows which is just a bandage over the lack of decoupled focus and window depth). AmigaOS certainly got better for the most part with the 2.x and 3.x series. Commodore's mismanagement is largely what did the Amiga in, not any technical aspects.