MacColl had both virtues and faults, as of course do we all, but both his virtues and his faults were perhaps larger than most. I see no harm in discussing them. If discussion of the deceased were disallowed historians would be out of a job.

However I'm not sure that much can be added to the earlier discussion in response to the OP's question. MacColl did a great deal to steer the Revival. Steering it away from the heavy American influence was a good start and if he was heavy handed in what he steered it towards it has had plenty of time since then to diversify in many directions, some of them inevitably not to everyone's taste.