Recently, I stumbled cross a rather stinging, yet even even-handed, critique of Ubuntu's Gnome-based UI implementation. In a series of blog posts, Farhad Shakiba - a self-described "unemployed software engineer, hardware engineer, artist, writer and body sculptor" - proceeds to pick-apart the Ubuntu desktop, providing copious real-world examples of where the distro falls short of delivering a commercial-grade user experience.
1. He believes that the new desktop effects "feel like hacks." Specifically, the various window animation and flow sequences. He notes how the "animation sometimes disappears when your computer is under load" or how the image "tears" during F-Spot photo transitions. Even the simple act of moving a window on the desktop can cause unpleasant artifacts, as captured in a screenshot in Part II of his series (i.e. the "Snapping Window" example).
2. He's also critical of the layout of the Gnome menu system's "branches and leaf-nodes."