Hes definitely worth working on. Those who claim he isn’t haven’t used him much.
Properly modded and on the right team he’s great. The zeta will help damage lost from having to use upper hand.
Lots of people underestimate scoundrels. Or dont get there mechanics. So it can be useful for a defence in grand arena.
Misson and zaalbar dont add as much as a full prepared squad does. Qira, young han, vandor, l3 are a good core group. You can use a second tank or nest for a good set up