The short version: they introduced terrible vulnerabilities on your network, they violated the GPL and they were also just bad at being...
Overall: the hardware seems fine, the software is shoddy and the security is terrible
This article begins and ends with two great tl;dr for IoT. There is value in this. Just look at the prevailing cluelessness, and be much better than that to stand out from the pack. In fact, how about applying that formula to the next nascent big thing that comes along?