I'm lucky enough to have the right sort of TPM so Windows 11 installed smoothly on my laptop through Windows Update. It's got some nice fit and finish improvements and round corners and generally seems well put together. Except for anything I actually use and care about on a regular basis.
It is still impossible to get rid of notifications with one click. This has actually regressed from Windows 10 as we're back to a little x to dismiss which actually sends the notification off to the action center for when you have some spare time to dismiss it a second time. Microsoft, spend less time on focus assist and more time on this!
The taskbar wants your icons in the center. If I wanted a Mac I would have bought one. Luckily there is a setting to move them back to the left. But one thing you can't do is have small taskbar icons. There is a registry hack, but it breaks the system icons so until that's fixed the main impact of Windows 11 for me is missing out on about one row of a spreadsheet. I would like those pixels back!
Maybe the start menu is better, but I stopped using that with Windows 10 and now just pin apps or search for them so I'd never know.
Updated 2021-12-04 10:35:
A few weeks into my Windows 11 adventure and I think they handed this one off to the designers and forgot the adult supervision.
Alt-Tab you have one job and it's switching between applications. Why then is the selection now indicated by a hair thin black border? It's pretty, but I now have to squint to figure out where I'm going.
Worse still you can no longer drag and drop to the taskbar. I don't do this every day, but it's a big time saver when I need it. Now I have to go through a re-org of windows to drag things between them.