1) The vibrate motor is a joke. I barely feel it in my pocket, doesn't even make a sound if its laying in the table.
2) The camera again is medicore
3) Battery life is bad
4) DAC + amplifier are mediocre
5) Build quality is lacking
6) Lacking LTE
NOTE: I my family we've a N4, a Galaxy Nexus, a Galaxy SIV and a Galaxy SII, so I can do some comparison.
1) False.
The N4 have a good vibration response, better than the Galaxy Nexus, which one feels uncomfortable.
When they are in my pocket I can't notice difference between it and the Galaxy Nexus (thus I don't like the GN when typing).
I don't use any sound but I think I could agree with the sound lacking: putting a speaker on the back of a phone is a bad idea, putting it on the back of a perfectly flat phone is an even worse idea.
2) No it's not: it's better than the Galaxy Nexus and SII (well it's newer) and it's not far from GII, which is aged the same.
3) What is a DAC?
4) False, it's well built, expecially for a 349$ phone. I own it since Febrary and it's still like new and buttons are still solid and "clicky".
5) Partially trure: you've to blame Google for this, as it's a software limitation and not an hardware lacking.