Which characters do you consider to be most underrated?

Krennic is considered as weak and unuseful but his leader ability, and other abilities are really great in the right team. I use him those times in GW with DT, ShT, Snow and EP and it's a festival of ability blocks.

Also Cassian can fits in such a team. He applies a lot of debuff, has a small CD and Crippling Shot is great in a DS team.