The behaviors mentioned in this post doesn't mean at all that you should stop using Windows 7 or shouldn't give it a try, these are just minor bugs (that can be irritating at times). You won't even notice these problems if you aren't a "Power User" of Windows.
It is not about new features that we want for Windows 7, it is about the old features that aren't completely built or show clunky behavior. Each feature has a behaviour, an interface set, which makes the user work according to itself, which develops "user experience". This interface or options set (whatever you call it), should be easy, contextual and accurate. Its purpose is to ease the user, not to make his/her experience worse.
Windows 7 Program or Task Switching Window Loses Focus
Since Windows Vista - I guess so - the windows task switching menu or windows, whatever you call it, improved - only for people who are able to run Windows Aero. Now it shown the thumbnails of the running programs and it shown an icon for the Windows Desktop as well. When you hover the Icon or Thumbnail - as in Windows 7 - you are actually peeking at it, all other Windows turn into glass while the one becomes more focused, its shadow's intesity increases and the glass becomes more vivid. But this isn't the case always, even with this HP G62 B51SE Laptop, which rates 5.0 in the Windows Experience Index (from 1.0 to 7.9), sometimes, the Task Switching Window in Windows 7 loses focus when hovering a thumbnail on it. The thumbnail hovered becomes focussed, but the Task Switching Window still keeps responding, moving the pointer on another thumbnail still works.
Focus, Once set on the Windows 7 Taskbar, cannot be unfocused
By this, I mean that when you hover on the Windows 7 Taskbar Pinned Icons, they show colors. And if, the mouse stays on one of them for a second, a tooltip appears. And in some cases, when you move the mouse away, the tooltip or the color on the Windows 7 Taskbar Pinned Icon would stay there.
It happened only once on a HP G62 B51SE Laptop, but many times on a PC, it might be due to the slowness of the PC - thats what I think. The Laptop scores 5.0 in the Windows 7 Aero category in Windows Experience Index. While the PC, doesn't even run aero, it can be due to the Windows 7 Basic theme. Anyway, its a bug, and its annoying.
Windows 7 Games Folder Takes Too Much Time to Open
The Windows 7 Games folder takes quite a lot of time to load itself completely, I don't know why but, it behaves mysteriously. The controls on game icons are also not enough, like instead of "Delete", you see hide in the context menu which actually makes no sense, hidden games can be shown again (not selectively - all at once). It would be good if Windows 8 Games folder includes more options and isn't buggy like this one.
Also, if you click on a Game icon, it will take some time, maybe a second before it gets selected, and the preview pane in Windows 7 Games folder (did I mention it has multiple tabs - Ratings, Performance and Statistics) doesn't remeber which tab was previously selected. Sometimes when you want to compare your statistics from all games you require the "Statistics Tab" to stay selected when you move from one game to another.
Windows 7 Start Menu Power Button
This isn't a BIG problem, you know the power button says "Shut Down" most of the times, so why read it? It never was a 3-lines paragraph you were dying to read, but its important as a part of the whole Windows 7 Aero interface, that it should be readable in all conditions.
Just like in every other place, like the Windows title bar, Task Switching Window, Windwos 7 Desktop Gadget Gallery etc, the text present on transparent bodies always has a glow that makes it quite readable, the same glow could've been used on the Windows 7 Start Menu buttons text, not just the Power Button, but all other buttons as well.
Windows 7 - Basic Theme doesn't Support Multiple Colors
For those people who can't run Windows Aero on both Windows Vista - if thats what you like - and Windows 7 are stuck with the Windows Basic theme, which is the worst theme seen in the windows history, yeah, if you don't count the Classic themes, they were the worst. But even those "Worst" themes had something that this landlocked Windows Basic theme lacks - customization. I don't think you want to get stuck in a room where you see nothing but "Sky" color, spread all around the "Desktop", the "Windows", the "Tools", everywhere.
Specially at night or in darker conditions, that "Sky" color is unbearable, even if you dim the display to its broadest. You'll still feel your eyes suffering. But this isn't the crack of doom, there's still hope in the Windows Platform, with the release of Windows 8 developers preview first, and the Windows 8 beta after that, I can say that windows IS getting better.