I like this summary of the Maryland Court of Appeals opinion in Attorney Grievance Commission v. Camus:
Disbarment is the appropriate sanction when an attorney is unprepared and repeatedly late
for court appearances, fails to enter her appearance in a case after being directed to do so by
the court, sends an unreasonable bill to a client in apparent retaliation for the filing of a
complaint with the Attorney Grievance Commission, takes funds from a trust account
purportedly for fees without notice to, or assent by, the client, and fails to respond to
reasonable requests for files relating to clients after termination of representation.
MLRPC 1.1, 1.2(a), 1.3, 1.4, 1.5(a),(d), 1.15(a),(d), 1.16(d), 3.4(c), 8.1(b), 8.4(b),(c),(d).
Ah, yeah, disbarment sounds about right.