I do agree that he was underutilized in terms of plot agency. He just sat around being red in the EVIL COMPUTER ROOM.
As for why Master Chief sympathizes with him. It seems to me that right from the beginning, 343 intended Escharum to be Master Chief’s narrative foil.
Master Chief has understood Escharum’s motives implicitly since before Escharum was even conceptualized. They are really not very different from his own. Their similarities are explored in the narrative, if you look at what they say. The idea is that they’ve led similar lives, except that Chief is less brutish. More humane, if you will.
Right from the first level, Escharum notes that he respects Chief for the fear he inspires in his enemies. When Chief walks into the House of Reckoning, Fernando tries to warn him that it’s a trap, but Escharum says something along the lines of, “he knows it’s a trap.” They’re both soldiers. They both live a soldier’s life. They both understand a soldier’s mindset.
I’m pretty sure at one point Fernando even asks Chief why he keeps fighting, and Chief says “It’s all I know.” That sounds a lot like a Brute to me.
This is just my interpretation, but if you look at it a certain way, both of them are pretty terrible people. They’ve both ended so many lives. Surely that’s a reality they need to confront eventually. Did they really do the right thing? Should they die proud? In the end, Escharum’s answer was “yes.” And when the time eventually comes, I think Chief’s answer will be the same.
Still not a great character though. He had the potential to be great, but they fumbled him
