Examples you can expand on?
But the combination of key shortcuts and mouse gestures makes it feel really nice to use in practice. Workspaces work like I'd expect, as do Alt+Tab and Alt+`. The built-in apps and settings have a level of consistency the Windows team could only dream of right now. Notifications in Gnome are fantastic. I could go on.
Form factor dissonance for another. GNOME clearly targets the mobile form factor, and it fails me for all the reasons Metro in Windows 8 failed me because guess what: I'm using a desktop/laptop, not a tablet/phone.
I had issues with ubuntu's unity back in the day and I switched over to i3wm, but I didn't find I used tiling enough to make it worth losing the usability of a desktop environment
I think it's more fair to say all form factors are treated equally, to the possible detriment of focusing exclusively on desktop. I think Gnome does well and is really versatile no matter which form factor you use, and I didn't have much issue moving from Gnome 2 to 3, or Windows to Gnome, or OSX (at the time) to Gnome (I've gone back and forth a lot over the years).
For me, workspaces (which Windows lacked natively until very recently) and Alt+Tab/` are how I get around.
The customizability argument is a solid reason to dislike Gnome, but not for all time. Things do get better each release. Well, except for extensions, which always break.
I'm trying to be as unbiased as possible. As good as linux is and as much improvements that have been made over the past decade or so, Windows and OSX still have the superior GUI. Just being honest about it.
The whole system control panel has been dumbed down so much, that it actively tries to prevent the user from finding certain settings. The system still suffers from simply doing everything slower than GNU/Linux. After logging in, it acts as if all is loaded and ready, but when one wants to do something, things still get loaded and icons added "next to the clock". Right click in file browser still feels slugish. Windows stops me from doing the simplest things by asking me silly questions, of whether I want to do, what I just told the system to do.
Very specific to my systems: The closed source graphics card driver crashes often, while the open source drivers have not a single time crashed noticably on GNU/Linux. On Windows this is noticable, because the whole screen freezes, until the driver has restarted. Never happened on any of my GNU/Linux systems.
It is simply not funny or justifyable any more.