Maybe the problem is that the interface is very similar in layout to Fallout, whereas the game itself is not. It makes people feel like they're expecting a Fallout-style game (particularly if they're just going by screenshots), but it sounds to be more like Darklands (at least where the "teleporting" stuff was involved; haven't been able to try anything but the combat demo).
I don't know where do you get that Fallout vibe about the interface. I don't see the similarity.
No, there are two problems (which are not problems actually, but whatever):
1) some people don't like teleporting (but since it became optional, no big deal)
2) the game is challanging, even more so than some old RPGs. And even Codexers didn't expect that.