I in fact LOVE the beta. It's everything I expected and more. But it takes some getting used to. You have to compensate for the new abilities and add-ins and expect what you need in a specific game. Or just which ever loadout you preform best with.
Also, for some of those dissappointed: you have to remember where this game is taking place. No only is this game on Reach, before the Covenant glassed it, but its also taking place before ALL the other games in the series, and BUNGIE is probably trying to take that into consideration...
Not trying to change anyone's opinion, just trying to put in more thought. That's my 2 cents.