Actually, I like South Indian movies (not sure Telugu or Tamil or Malyam or they are) which are dubbed in Hindi but the only South Indian movie which was remade in Hindi I liked was Sarfarosh. Actually, the dialogues seem better than the original. Also, Naseerudin Shah's acting was much better than that of Jackie Shroff in Astra (Thats what was the name of the movie dubbed in Hindi).
To tell you honestly, Bollywood film makers don't pick the right South films to remake. Wonder whats this new obsession with picking trash South masala films and remaking it in Hindi? There are some really good South films that you can pick and remake in Bollywood. Ghajini was a good pick (it was an action packed film, but a film with an interesting story and entertainment). Actually John and Vipul Shah have picked a very good Tamil movie (Kaakha Kaakha) and are remaking it as 'Force', but the problem is that John and Genelia look awful to the audience who have watched the original version and adore it so much (they are misfits to the characters they play). But I am guessing that the audiences who haven't watched the original might like it.
Force is a film you guys should really wait to watch. Also there is another movie coming up (with Prateik Babbar and Amy Jackson with AR Rahman's music). Its also a remake of a recent superhit Tamil film and a very good film too.