Had a play with the mini and revised ipad 3 yesterday. The mini is a really well made piece of kit but the screen is just poor compared to the ipad 3, no way could I spend that much money on old screen tech. Its not just the res but colour, contrast and reflectiveness all seemed much worse as well. It was the same comparing the Air and normal MBP to the new MBP retinas, the air's screen just looked flat and lifeless like several generations behind.
Just been playing with a nexus 7 in work and yep it does feel pretty damn cheap compared to any of the apple products. The screen isn't great either, it's PPI isn't that much over the mini and being 16:9 it's fine for movies but not as good for anything else. Comparing a webpage on the nexus to ipad it's like about 200px of height has been lopped off.
Maybe when the mini retina comes out it'll be the most complete tablet so far.