Koi... Mil Gaya was a lovable film which had a happy fairy tale ending. But Krrish and Krrish 3 kind of takes away the awesomeness of KMG. Because we know that the happy ending Rohit and Nisha got in KMG is short lived, as their fates are horrible in the Krrish films.
Also they make Jadoo responsible for the whole mess. If Jadoo had never given his powers to Rohit, he would've a lived a simple but happy life. Because of Jadoo giving Rohit his powers, he first gets used by Dr Aarya because of which he loses his 20 years in sleep. He also loses Nisha in the process. Then when finally he gets to be reunited with his son and live happily with his family for the rest of his life, he gets killed by his other son.
So all in all, Rohit is a very tragic character. Was mocked and ridiculed by society for being mentally disabled for half his life, remains in coma for another half and then finally dies.
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