However, all things being equal, what he is doing would be a good thing, right?  He is trying to provide a high level channel of communications between these countries, working for dialogues over violence.

If his efforts contribute to an eventual truce, then he will have done a good thing, even if he was partly motivated by getting more praise as a great peacemaker.

Or is the consensus simply that he is such a nitwit that all his diplomatic to-and-fro'ing is useless at best or perhaps even counterproductive to finding a peaceful resolution to this mess?

Cynicism is intellectual treason.