Loved the set up (and potential) for the character, although by end his character arc (if he even had one)  was the least well served and built on,  by the season.
His whole diversion  on the cube didn't serve his character arc  at all. And didn't help  what could have been a defining  face off with Narek, which  when it finally came fell  completley flat.
I think his first season arc they really should have just  bonded him to Picard and developed that specific relation  and loyalty. Only very slowly opening to others.
Instead they  bounced  him around emotionally with over-dramatic loyalty moments first it's   Picard, than it's Hugh, no it's Seven, no it's Raffi in the end,   spreading him so thin,  just made all his supposed character driven (search for purpose and role) moments,   somewhat meaningless.