Wow, this stuff sounds retarded. Glad I have never been subjected to any of the prequel EU (beyond the Brooks, Salvatore, and Stover novelizations, if you want to count those as EU).
Jackson did totally suck as Mace Windu. A shame too, he could have made a pretty cool Jedi. If I am not mistaken, he begged George to find him a part in the prequels, in that case, it is not that he was miscast, it is that he was given a part that didn't work for him. Sam is good at the laid back cool badass kind of characters, and George gave him the part of a tight assed authority figure. Whole thing felt forced for him.