I am going to get a lot of hate for this but I kind of prefer all of the SCV voices compared to any of the SC2 voices personally.
-I love Ivy's voice and feel it really matches her character (better than her Japanese va) and is appropriate for her age.
-Charles Rubendall voices an extremely cocky, arrogant and emphatic Raphael which I feel matches him well. I think most people are favoring SC2 Raph for the lack of "Amy" lines rather than for the content of the rest of his lines but I am probably wrong.
-I actually enjoyed SCIV Nightmare but SCV Nightmare (same va as Raph?) plays a wicked Nightmare and is probably who I want to voice Nightmare for now on.
-Algol has the perfect voice actor and it will be hard for me to imagine some one else voicing the Hero King now
-Tira probably has the best voice acting by Jeniffer Hale (thank her amazing range) this game and really got into her role this game.
-I am a big fan of Johnny Young Bosch and originally I thought that if Leixin would replace Kilik than I would want Johnny voicing him for the role. Next day Xiba was revealed and a few weeks afterward the english trailer came out. I feel it is appropriate (though I sympathize with the fact once you hear Johnny's voice once you hear it everywhere).
-Roger Craig Smith is an appropriate Siegfried and although I love Crispin Freeman a lot, I felt his voice providing a deep-voiced, brooding warrior was a bit overkill.
-Cervantes has an amazing VA in SC2, without question, but I think SCV brought an improvement to SCIV and brought more life to the character (SC2 Cerv sounded too flat with his ghost self. It does not fit the current Cervantes).
These are a group of my favorites but I think SCV was very well done in both dubs and definitely does not sting my ears. Then again, I do not believe I am too picky with the voices I hear, so perhaps I am not as suited for my opinion.
--Forgon