I understand perfectly this because I had a Galaxy Nexus and as soon as I got Jelly Bean update Bluetooth stopped working properly. Now I have a Nexus 5 and it's by far the best phone I had but recently and as much as I like Lollipop this kind of bugs without updates are unacceptable. For use iOS also had have problems and I remember my first week with iPad air 2 where safari crashed the whole system but Apple managed to fix this.

So this leaves my thinking I will not get a Nexus as my next phone. I would rather get an iPhone or a HTC/Samsung. I won't do the same mistake for the third time. I love nexus and his potential but Google doesn't care about their costumers.