Of course they are "different cases" - there are always separate macroeconomic conditions, and there was government intervention in the acquisition, but the fact still remains on the "worst corporate deal ever" front, BAC acquired a company that lost $20+ billion in the first post-acquisition quarter.
They are not comparable. Its good info and context, but you're overselling it as a comp. "worst corporate deal ever" is shorthand for executive decision. ML was too policy infected to be considered a "real deal" with other options on the table. If you take the "choice" away from the transaction, you are no longer takling about a "deal" in the common sense of the term, IMHO.