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.