I have unlocked the bootloader and if a hardware fault occured I would ask Motorola to fix it, if they said no as my warranty is void (and refuse to fix it whatever I say) my only option is to then take to them court. Am I going to do that over a £160 phone - no Im not, I'll just buy a new phone as taking Motorola to court isnt something I fancy doing
I guess there may be other options, eg some sort of civil rights organization which helps with warranty issues which may or may not cost money, but even if its free its still going to cost a lot of my time.
I think if you unlock the bootloader you really want to acknowledge that the chances are that Motorola wont be fixing your phone, whether thats lawfully right or wrong may not be worth your time and money arguing over.
Personally I wouldnt blame Motorola for telling me that made my choice and now to live with it.
What I do think is a shame is that they dont officially release the stock images of the moto g as they do with their dev editions of some phones. After all that may remove a lot of support calls they get (and then refuse) from people that have screwed up their moto g's by unlocking and rooting etc.