I'm not trying to defend Apple here, I think the mini was a poor effort because of the screen. At $329 they should put a higher resolution screen in to differentiate themselves.
But in all other areas I think the mini's fine.
Glass is glass, you drop it, it's going to break, one way or the other.
Benchmarks don't mean crap. You use a 7" tablet to browse the web, check emails and access facebook for goodness sake, not to render Avatar. It's all about a smooth experience on tablets, not about the quad core processor or the 1000 more geekbench points in it. IMO browsing the web and facebook and email and books are far smoother and overall a better experience on iOS than Android - better web rendering, software polish, developer support and ecosystem.
On top of that, if you want to play games on the thing (and hence why you want a better processor) - well most games aren't optimized on Android, but they are on iOS. Add to that consideration the fact that the A5 GPU is better than Tegra 3's.
All together, the Tegra 3 vs. A5 argument in the Nexus 7 vs. iPad mini debate is moot. A quad core processor on Nexus 7 brings no benefits over the weaker A5 on the mini.