Totally broken indexedDB implementation. Random rendering issues, especially if you happen to ever use z-index. Hacks needed to get the most basic events to trigger. Idiotic scrolling behaviour. Choppy animations that didn't adhere to basic CSS standards (even the ones that weren't added by Google).
Honestly, it was a mess, and sometimes felt like a deliberate ploy to stop web apps from becoming viable. Things are better now. Just waiting for them to finally add web push notifications.
