I don't suppose that Isildur's the Ar-Pharazon type of guy--even before he took the Ring. The Disaster of the Gladden Fields tells what kind of father he was--he seems to be compasssionate enough to not be compared to Tar-Calion. He sent his esquire away with what remained of his daddy's sword... a proud man wouldn't have done that in my opinion.
And I suppose he's the compassionate great leader Brian Crawford seems to think--maybe the Ring has just partially corrupted him.
Try to reread the Disaster over again; it might help.
