The trouble with the BC is that it's not even wrong.  On its own terms it is unimpeachable.  All of its answers are true and all of the questions important.  Yet it fails at communicating the Gospel and at forming a conscience because it provides little hint of the thought behind the answers.

It is no wonder that the generations formed by the Baltimore Catechism were defenseless against modernists and post-Christian moralistic therapeutic deism, so easily led astray by the charlatans who used "Vatican II" without reference to the council itself as an alibi to preach a different gospel, and unable to pass the faith on to the next generation.  Let's not forget that everyone who made a mess of things in the 70s and 80s--from Dearden and Hunthausen down to bad CCD teachers--was formed before Vatican II!