That's the problem with come backs, people expect to hear something like a previous entry but when it's something different they're disappointed.
I cannot remember when people were happy with come backs, i have never heard "Oh that is sooo much better!"
And we have many examples of come-backs.
For Serbia Zeliko.
For Bulgaria Elitsa.
For Greece Sakis & Helena.
For Iceland Yohanna.
For Ireland Jedward.
For Israel Dana.
For Malta Chiara.
For Moldova Zdob si Zdub.
For Romania Luminita & Ovi/Paula.
For Russia Dima.
Only our Queen Valentina Monetta is an exception,who came back in 2013 with a marvelous song !
Oh and that girl from Germany who won,i dont remember her name..