Giving a voice for a character is such a defining factor that it might make you hate the characters just for that... you don't get to decide anything for yourself. The first final fantasy character that made me go eww was in Final Fantasy X, which was the first to have voice acting. Bad acting can take so much away from a character as opposed to no voice acting at all(or good voice acting changing a character to something you don't like). Then again there are games that were made a lot more fun with voice, like Dragon Quest 8 with funny british people. BUTTTTT, there are certainly a lot of people who totally couldn't appreciate it. IMO FF12 has really charming actors.
Sonic's latest on ds, sonic rush adventure has new voice for sonic which bugs me a lot... wonder why they changed it. He didn't really annoy me much apart from funny furry adventure story in the previous game.