Yea, there's widespread reports of a signal issue with the GN. Some hold hope that it can be fixed with a software patch.
If the screen is a big factor in your purchase decision, I'd eliminate the RAZR as it's got the worst of the 3.
An easy way to help you compare the phones on a technical level is to use
Phone Arena - Phone News, Reviews and Specs
Compare phones: Samsung GALAXY Nexus CDMA, HTC Rezound, Motorola DROID RAZR
That compares the specifications of the 3 phones you were looking at.
In order to determine which phone is good for you, you'd need to ask yourself a few things:
1. Do you like the idea of or need a removable battery?
2. Do you use removable storage (microSD)?
3. Do you want a screen that is physically bigger, or do you want a screen with better clarity?
4. The signal issue: Do you think the slower signal speed of the GN would affect you so much?
5. Updates: If you get the GN, are you okay with having both the most frequent updates, and most frequent software bugs?
6. Do you frequently use the phone to play media?
If you answer yes to both #1 & 2, then go with the Rezound.