Earlier quoted context omitted.
Of course just comparing on price ignores some big differences. Nexus 4 has no LTE. Nexus 7 has terrible build quality. Nexus 10 has nearly half the battery life.
You're the first person I've ever heard say that the Nexus 7 has terrible build quality and the AnandTech figures show that the 10 has around 90% of the iPad battery life rather than "nearly half".
My current unit has a speck of dirt trapped under the screen, but I don't really care that much anymore given that the thing was $199. You'd be a lot less annoyed about a rattle in the dashboard on a new Corolla than you would if you bought a BMW.
Battery life during use is generally good, but the battery in mine dies completely after ~4 days of non-use. Stock install, nothing but my Google account signed in. I'm not sure if it's a hardware issue, but reinstalling the OS hasn't fixed it.