It was no more different than playing quake with bots. The game controls are no different, the game format is no different than quake (such as moving around).
You may already be saying that it was developed in the UDK engine so its "bound" to be the same, but not EXACTLY the same. The game is no different than quake, its basically just a modification with the addition of female models and cosmetic jokes.
From the steam forums, loads of people are cancelling their pre-orders.
If your anticipated about this game just lower your expectation by a few digits.
(Added Poll for 1month)
I also spent the pre-order money on Battlefield 3.