I don't think its underrated. I have a lot of trust in the nerds crunching the numbers and while it can never be exact, its probably already as close as it can be to reality
I think in this particular situation though, Raleigh is having a much worse year defensively than anyone issued to seeing, even though its still good. IF he was his usual defensive self along with his current bat, his WAR is probably close or even passing Judge amd the conversation is much closer.