Yeah, it was a real letdown with the alien shootout. The movie was great exactly
because it was such a small, intense chamber play. The ending was anything but that. But up until the ending I thought it was great. I loved how ambiguous and intense it was. Goodman was great. You were never sure if he was a lunatic or a decent guy. The uncertainty of how he was going to react to anything was so unnerving.
The original ending, however, would have been much better:
http://collider.com/10-cloverfield-lane-ending-original/