Theodore sounds identical to the original show...although according to IMDB, its the daughter of Theodore's original voice doing him.
but yes, the other two boys, the 3 girls and Dave are all voiced by the original actors. If they would have used them for the live action movies, it would have made a big difference.
the show is playing right now as i type this and if i didn't know better, i'd think it was the original series based on the voices. i get that the Chipmunks and Chipettes are altered electronically but you can still tell when its not the originals.
I think Theodore is cute enough but I find him a bit more annoying in this one . Sometimes he can be cute but they have placed him more into the role of the baby and sometimes it can be annoying as he is a lot more immature than his brothers .In the original he acted more like his brothers only with the cute lines placed in but in this they are over playing him .
It's the same as the original. What bothers me is he's not as fat as the original 'cause God forbid we show kids today it's ok to be fat and confident.