I was disappointed in the chocolate bock. Too light/thin for taste. I was expecting something hearty, complex, and potent. Didn't get any of those out of the CB. It was ok, but didn't taste as good as the bottle looked.
After going through three of the Winter Classics packs, I can tell you there is some very distinct quality issues with the Chocolate Bock right now. One pack, both of the CBs were like you described. The second was great, and the third I had a bottle of each good and bad.
Definitely been a craps shoot with them for some reason or another.