Carousel is the absolute worst aspect of this game mode.
I had typed out a few paragraphs, but these forums are a cancer anyhow so here is the short version.
The carousel is bad. The level of disparity in item distribution is bad.
The other autochess game has fixed their major anti-fun mechanics, and now the crazy randomness of items and the unfun bonanza which is the carousel has managed to take the title of least fun version and pushed me off. I really hope that Riot fixes what I feel are the worst aspects of this mode as I really enjoy autochess. But, for now, I'm tapping out on it.