I'm Gonna Git You Sucka was funny, it was dated but that is the nature of that style of parody. It led to other funny films, too. It was good not great.

Lean On Me you also have to see in context, I think it would be kinda corny if it were released today but for its era, it's good.

Roots, I mean how does it suck? It could have been even better but overall it accomplished what it set out to do, which was ambitious.