Spoiler tag for space^
I can understand that you don’t care for Adolin because, paraphrasing from the two people I quoted, he’s got more of a plot driven arc and he doesn’t have as much emotional development as the others surrounding him, more supporting others development than developing himself. I personally like Adolin because of his function as this supporter. He’s a character who is there to just be a good person, a buddy for kaladin, an anchor for Shallan, a right hand man for his father, and functions well like that. Granted, he definitely he isn’t very good until Oathbringer, but I love him and Maya in RoW, and the trial chapters are lovely. His arc can be flat, but he only improves the arc of others.