With the Johar camp you associate a good story, good production, good songs and the 'King Khan'. The movie is definitely directed by a another (Nikhil Advani), but it is a Johar camp movie. It is so worth watching and with it Karan Johar has confirmed the he is indeed a milestone in Hindi Cinema history. To answer these and other questions: Was it worth it: well depending on your perspective of what an entertaining movie should be like, then the answer would either be: 'yes definitely' or 'you will be mad to miss it'.
Being one of the first person to watch Kal Ho Naa Ho in my group, I was constantly battered by the same questions: is it worth it? what would you compare it to? whats it about? etc.