I care more about software quality than hardware quality, and as such, I don't see myself getting a non-Nexus Android phone anytime soon.
Samsung make some pretty solid hardware. Unfortunately, their software is a net liability. That said, Samsung has been doing better (lately) when it comes to rapidly updating their phones with newer versions of Android. But they're still way behind Nexus phones in that department.
Frankly, Android has a lot of maturing to do on the software updates and distribution front.