The thing that I seem to have to tell people at times is to remind them that - this is a beta.
It isn't running at full throttle yet (especially not graphically - the difference between the alpha and beta is good, but it isn't all the way up yet. I expect the final to look better).
It is a beta so there are going to be a lot of maps, game types, burn cards, tier kits, ordnances, and weapons available that haven't been included yet that will be present in the final game. There is a thread on Neogaf with someone who has scoured through the PC code to find a lot of those things.
There is STILL a multiplayer campaign that hasn't been unveiled yet. I think there is still a lot left that Respawn hasn't shown us yet and I can't wait to see it. I've had a blast playing this game.
The only thing I question so far was their decision to turn the Kinect mic ability off with no way to turn it back on. that's why I think it is so silent when you're playing. During the alpha the Kinect mic was 'on' and everyone talked. I've been surprised how quiet the beta has been...
From that Neogaf thread, there has also been speculation that there could be 'monsters' in the final game too... so, if we could have mini-pacific rim type fights too? Yes please... at least according to this tweet...
https://twitter.com/jwhdavison/status/435904855295528960