Guys, try reading his post:
"When I want to build my project I do not want to press a play button."
He said BUILD, not RUN. A Play button is to build and RUN the project. I agree with his objection: There's no Build button in the UI.
And even worse is the width of the combined drop-down list for configurations. There's a vast expanse of empty space in the (now non-customizable) toolbar, and they made this control SMALLER. The information it should be providing is cut off in all cases, even with short project names. I try to be sympathetic to the Xcode team's tasks, but this is idiotic.
"The Xcode 4 interface should not imitate iTunes."
The new design has its problems, but this kind of feedback isn't specific enough.
The team did try to clean up the mess, and were successful in some areas. A modern, single-window design is laudable. But the document handling is just abysmal, as it has always been in Xcode.
The tabs don't make sense (they're even upside-down); the "counterpart" button is gone; you can't split the editor without invoking this misguided "assistant"; error messages appear in this narrow column on the left, so of course they're truncated to the point of uselessness and if you go to the results and put them in the main editing pane, it doesn't pull up the relevant source code at the same time.
Aside from the document-handling fiasco, there are lots of plain old bugs in Xcode 4. Worst of all is that it simply won't build a lot of projects that worked fine in Xcode 3, stopping people's work in its tracks.