Sandroidfan
Android Expert
For me personally, there is definitely a significant difference between the Motorola radios and the one in this phone.
I came from a Droid X. Never had reception/call/data issues. Sitting exactly where I am sitting now, my signal strength with the X averaged between -90dBm and -80dBM.
My S3, right now, is -120dBm (searching for signal). If I put it near a window or door, I sometimes get as good as -90dBm.
So you roughly see about 20dbm difference between DX and S3. That's actually about the same signal strength between ICS and GB phone unless you turn off 4G radio in ICS. This signal reading issue has been beaten to death in Gnex forums.
Those numbers are certainly not pleasing to look at, but I wouldn't worry too much unless it's dropping calls/data badly.