Nemesis in RE3make is definitely nowhere near #1. I think Birkin is my top, but I'll take him in second.
Otherwise, not a horrible list. I would have had U3 from RE4 pretty high in there though (top 3 for me). One of the scariest bosses in the entire series, and evading it through the suspended storage containers until the actual boss fight was a fantastic section. I also definitely wouldn't have Uroboros in there over Wesker or Krauser.