As mush as I love the original concept behind Windows Phone’s start screen, I still have a few things to complain about.
There just seems to be a lot of wasted space on the start screen. You will notice there is a quite spacious black empty space at the top and at the right of the tiles. I understand why the top was left blank (for toast notifications) but it just doesn’t look right with all that space left blank.
The same thing applies to the empty space to the tight of the tiles. It just doesn’t make sense to me to see all that wasted space for displaying an arrow.
I don’t know if you also noticed, but the length of the home screen doesn’t fit the amount of tiles it can display. When you first see the start screen in its default position (scrolled all the way to the top) you will notice that your screen will only show the complete length of 3 tiles with part of the 4th tile covered where you have to scroll to see the rest of it. Even though it’s only a tiny part of it that is covered, that still feels like a flaw in the UI design.
Apart from those three design flaws (in my opinion at least) Windows Phone has proved itself to be the most enjoyable experience you can get on a mobile operating system.