Where are you seeing him being a 3 star now?
https://247sports.com/Player/Taulia-Tagovailoa-90519/
https://247sports.com/Player/Taulia-Tagovailoa-90519/high-school-192068/
There were several "experts" who thought he might be better than his brother at the same stage of their careers coming out of HS -
Where are the "negative" reports of him while he was at Bama?
It's hard to find many reports at all because Saban doesn't give much info period especially when it comes to backups. If anything, he flips out when asked about the progress of guys who are in that role.
I heard a rumor from an actual coach that he would end up at Oklahoma or Maryland as soon as he hit the transfer portal. The Florida schools were only connected because he said the main reason he signed with bama was so his parents could travel to games. But, in reality he just wanted out of his shadow.
I think he's a good QB. I don't think he's his brother. I do think he has pretty strong arm and some escapeability as a QB.