Good question. For me personally, any type of server issue is considered a major problem. The beta and hard copy will run on different servers but they have to basically be set up the same. Look at Confrontation. It's Beta was basically shipped to us as the game and it took awhile for Slant 6 to work the server issues out. But I can't recall if Confrontation had a pre-patch or not but I am assuming it did since most games do now days. Also, we're talking about two totally different companies with Zipper and Slant 6. I remember the MAG beta running fairly well but I didn't buy the game so I am not sure how everything went at launch.
So my answer, Server Issues. I want to be able to play this game at launch.