Ok, so here are the points where GNOME 3.0 is worse:

- Basic window manager capabilities since twm and fwvm require extensions

- JavaScript all over the place, and for several years, GJS + SpiderMonkey had enough leaks and loss of performance versus the C based extensions

- Windows like registry for gsettings.

- One needs a third party app to actually edit gsettings in a comfortable way

- Multiple reboots on the IDE tooling, the new designer actually uses Web rendering tech for what are supposed to be native applications

- The way virtual monitors are managed versus traditional X Windows managers is bonkers

- No support for Windows shading, again another classical X Windows manager feature

Plenty of others I could list.