Due to CASSANDRA-12888 the way MVs are being repaired changes.
MV has been repaired by repairing the base table. Repairing the MV separately has been discouraged. Also repairing a whole KS containing a MV has been discouraged.
MVs are treated like any other table in repairs. They also MUST be repaired as any other table. Base table does NOT repair MV any more.
Repairing a whole keyspace is encouraged.