This section is quite interesting but I would be more fitting to talk about Overrated vs Underrated for Zenith or Arena only.

As for regular battles I'd say Chunin Shikamaru is very underrated. I barely want to try my chances in Decisive Bonds anymore without having this guy around because 100% Defense AND Resistance on top of extra crit and being able to increase mystery cooldown on your enemy and decrease your own is just so good and not a lot of people are using him as a support these days.