It's not a good design if it doesn't work on my cell phone
A desktop-based web browser is one kind of usage scenario. A PDA/phone-based web browser is a different one in most cases.
This has to do with layout, but also with the amount of text to display, user needs, motives and expectations, how to navigate etc. Most likely, the usage scenario is too different to allow the same design to work in an optimal way in both scenarios.
So saying "it's not good" if one design cannot accomodate both scenarios is a tad simplistic IMHO. The problem is bigger than whether a layout is/should be pixel perfect or not.
/J
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