First, the tablet needs root. Once root is done a dev, OR anyone with the right knowledge, can go in and properly code and clean up and add to the prop files and other related files that give the GPS crucial information on how to act. It has been clearly pointed out some of these are not properly written or incomplete. But people just roll right over that and focus on the metal back.
Second, given the other huge change about this tablet from any other is the Tegra 3 chip, again, once root is attained and a more savvy dev is able to get in a poke around, there very well might be a chance that the GPS is not using the cores properly and thus, we get sporadic results given how the Tegra 3 chip and it's companion core delegate workload. Another interesting possibility people just roll over and focus on the metal back as it has been repeated over and over and over as the cause.
Three simple tests to prove the back cover guilty beyond a shadow of a doubt:
1) Take it off. If the Prime's still piss poor, it's not the cover. If it suddenly works as well as the TF1 (a fairly low bar), case closed.
2) The plastic-backed Lenovo and Acer will be out soon and revealed at CES. I know an editor from one of the online rags and he's going to test them (if he can) at CES. If another Teg3 works fine, it has nothing to do with the SoC.
3) For those excusing the issue as s/w because "the Prime was always supposed to run on ICS and HC was rushed" that answer will be available on January 12th.
Since people are still unwilling to accept that the manufacturer themselve's has publically stated that it's the metal cover, hopefully one or all of the above will convince them. I have seen the XDA development community work miracles, but never once have they been able to overcome a h/w issue with s/w. Make it better, yes. Fix what can't be fixed, no. A good example of their limitations is working with a device that has an Nvidia SoC because of its locked and proprietary drivers.
I'm not trying to convince people that don't want to be convinced. But people reading these forums could easily buy in to some of what's being said; especially since it's being said so strongly. And while it's not impossible that it's s/w, it seems like a long, long, long, shot.