First of all, they tried to do something new. They came up with a idea but failed to implement it properly.
Storytelling was not that good, dialogues was average, they didn't focus on these things.
VFX and visuals were good, specially in 3D. It was good and compensate the cons.
The initial part of the movie was amazing, SRK did a great job. But Ranbir-Alia love story was annoying, it was too much and didn't make sense. They could have avoid the too much love story. Another thing is when someone has supernatural power then how he/she is defeated by bullets, It doesn't make sense. The makers, they still have so much influence of typical bollywood type love story they put it in almost every movie.
The film is good enough give it a try. The visuals won't disappoint you.
I hope that the second part will be better and hope that SRK will play a major role coz his acting is amazing.
Let's see.