The Nexus line of devices consistently offer the most bang for your buck. It's why many of us purchased a Nexus 5—at a $350 entry price, it's half the cost of any other phone with similar specs.
Google manages to sell these devices at that insanely low price point by cutting a few minor corners here and there. For instance, the camera sensor in the Nexus 5, while certainly capable, is lacking when compared to its peers. As one of the most expensive pieces of hardware, Google had to "skimp" a little here to meet their low price target.
And surely, you've noticed the low speaker volume, right... more