Earlier quoted context omitted.
I just looked at Lenovo's site. I see plastic cases with mechanical latches. This is not "comparable build quality".
The ThinkPad series has had, for as long as I can remember (including the ThinkPad I got last Christmas), a magnesium rollcage/inner frame [1]. Build quality is more than what you see with your eyes. Sure, it's not pretty and isn't unibody, but that doesn't mean the build quality is uncomparable if you're looking at it from a "ruggedness" perspective. Disclaimer: I owned and used a 13" unibody macbook pro for 3 years…
When the plastic latches break off, will my laptop stay closed? No? Then it's not comparable.
When the slider for the latches breaks off, can I still easily and comfortably open my laptop? No? Then it's not comparable.