The way I've always seen it is that Morrison needs to be an offensive focal point to be productive. Charlotte was able to make him that focal point in his rookie year, and he was a really good player in stretches of that rookie year, but at the end of the day, his shooting dipped, his confidence dropped, and therefore, Charlotte's confidence in Morrison dropped.
The problem is that Morrison's a natural scorer, but he can't really do much else, so the trade Los Angeles really ruined his career. He wasn't a great defender or facilitator, so a ball-dominant player like Morrison never saw the light of day in an offense that was headed by Kobe Bryant, maybe the most ball-dominant player in the game.
As a big fan of NCAA basketball, I've always rooted for Adam Morrison though. He had one of the greatest NCAA careers of all-time, and he gave us one of the most exciting chases for the Wooden Award as junior at Gonzaga, going head-to-head with senior J.J. Redick, from the traditional Duke powerhouse. I'll never forget that season. Both players were playing out of their minds, with Morrison averaging 28 ppg on 50% FG/43% 3pt and Redick averaging 27 ppg on 47% FG/42% 3pt. Both players seemed destined for greatness (well, at least Morrison... the writing was sort of on the wall for Redick being a niche player).