I've played beta of Halo 3, Call of Duty 4, Call of Duty World at War, Bad Company 2 (on ps3 and 360), Halo Reach, and Gears of War 3. You know what they all have in common? They all play out like demos and they all represented the final product, unlike what the little disclaimer usually states.
As anybody with common sense realizes these days, open betas are treated like demos and people will judge a game from one no matter what it is "referred" as.
In this case, the Battlefield 3 beta was not handled well by DICE for 3 reasons
1. The timing. Why would Dice release a beta less than a month before the game comes out? The game is almost about to go gold (if it hasn't already) and the devs will only be able to fix things through a title update when the game releases. If the the managers at Dice had been smart, they would have released this beta 6 months ago. This leads into my next point.
2. The build. Apparently, Dice is giving us a build of the game that is even older than the closed Alpha that was on the PC. Why? Don't you want people to find glitches that haven't already been found? Don't you want people to like the game so that they don't spread a bad word about it like they do now?
3. The map. Operation Metro pretty much gets Battlefield as close to Call of Duty as possible. Wide open areas for sniping combined with cramped hallways for close quarters spray-fests. If anything, you should have given us a map with ALL of the vehicles so that we could test all of them out for glithces and bugs.
TL;DR So the only logical reason the beta is the way it is (if in fact the actual game isn't quite as garbage) is because Dice just wants to test the servers. This wasn't a very smart move considering all the disappointment going around the internet. So what if it isn't the final build, the fact that Dice handled the beta the way they did causes me to lose more confidence in what the final game will be like.
I will still be purchasing the game but I will be surprised if the game runs as smoothly as Bad Company 2 come launch.