The header and input bars are too big. The max width of the response is too narrow. The font is too large. The way it renders onto the page feels weirdly clunky. There is a whole sidebar in addition to the top bar just for two buttons. In the + button under user input, they hide everything under there like model selection even though there's a ton of real estate to the right of it. Everything feels unnecessarily cramped on the page in spite of ridiculous amounts of whitespace.

Yet my ultimate dislike feels like something more than the sum of the parts. It feels like the Yahoo of AI. Anyone not relying on distribution advantages would know they need to do better.

It really speaks to Google's perennial weakness: they can never seem to make an incredible UX.