Anyway having the nexus 5 I definitely disagree with some of the statements here....
The one I will confirm is that the first week I had the phone I had a call quality problem but it was fixed when I got the 2nd of 3 updates I've received in the couple months I've had it. No more issues and the signal strength is almost exactly the same as a gs3 and gs4 mini that belong to coworkers and we were trying to make calls out in the bush. He had 2 bars and failed to make a call and I made the call on 0-1 bars successfully. Monitored signal for a bit as we were trying to find a place to get signal.
Battery life is great for me. 0% drain overnight with WiFi etc off. I get 2 days and 3-4 hours of screen time or in heavy use up to 5 hours screen on time. Not the best but not bad by my standards. Best phone I've had yet.
The speaker is much better than the HTC one S I used to have and I overall liked that phone.
The camera may not be the best and software could be better but its the best camera phone I've had yet.
Build quality seems decent to me. I'm sure I'm missing something else I saw in here but I had to say something cause I'm reading a lot of stuff that has never affected me and people are talking like its the worst phone ever.
Sent from my Nexus 5 using XDA Free mobile app