I think a lot of it was everyone was seeing 4 full bars on gingerbread before going to the sgs3. Ics has changed the signal layout, as mentioned prior, add that to everyone being gunshy of Samsung radios (rightfully so) they don't think it's that good now.
The problem with saying that is unless you know this to be the case with "a lot" of owners complaining of poor reception, it doesn't really help determine how many people are actually getting worse reception than they would with another brand/model of phone. You may be correct in some cases but it really does hurt the credibility of the people who have worse reception and have stated so without going into enough detail.
If EVERYONE reporting poor reception would at least include real world, hands on, "Can you hear me now" and effective/non-effective 3G/4G coverage info along with how many bars or the db level it would go a long ways towards convincing people like yourself who aren't convinced that Samsung/Verizon has a problem with the SGS3 reception.
I'm not saying that reporting db data is useless but I think we can all agree that there are a lot of variables that frequently makes it's value in determining reception level unreliable. It's easy to compare an SGS3 in a fringe coverage area, (Every town/city has some known weak spots) to what you knew your old phone to get or, even better, side by side with another brand/model of Verizon phone at the same time in the same place. Are they both able to send and receive a phone call without dropping? What's the call quality? How about data? Do they both get 3G or 4G? Can they both log onto the same website or does one say, "Website not available" or, "No internet connection" (as mine will do most places in my house but NEVER with my Droid X)? These kinds of tests are the only tests that really matter at all. Throw me (SGS3) and any home run king major league slugger (Droid X) a slow and easy pitch with a tennis ball and we can both bat the ball way into center field. That represents medium to excellent cell phone coverage. Now throw a 90mph fast ball at us and the home run king will knock it out of the park and I'll be lucky to get a foul tip. Unfortunately my house is the cell phone coverage equivalent to home plate in Yankee Stadium. Nothing but fast balls and my SGS3 is striking out every time while all of the other phones in my house are getting singles and stand-up doubles.
Benny