Except for the VFX there is nothing much in the movie.
The story writing was not good. A 2hr 30 min movie. What looked as a very good movie on paper doesnt actually in reality mainly Due To Very Average Screenplay and so fails to live upto expectations.
The 1st half of the movie was very dull and confusing. A lot of things were happening simultaneously but there is no sequence or relation between them making it so damn confusing. Like there were phones flying out of people hands but where were they going no one knows.
The 1st scene keeps you on the edge but then the movies goes crashing down and you keep thinking what the hell is going on.
Things start getting repetative and messy. The action scenes become long and lifeless.
VFX, Thallaiva and Akshay Kumar are the only reason why the movie is making money.
The second half does better when a much need change comes from Akshay Kumar who is an old orinthologist who tries to save birds from mobile phone radiations but fails returns as a vengence seeker due fast depletion of bird population and aims to remove mobile telephony from face of the earth and now only Chitti can stop him!
Everything Could have seemed much more convincing had the plot and screenplay done better. The message in the movie was strong but the delivery should have been better.
Thallaiva now shows signs of wear and tear.
Overall I feel the movie is a bit jumbled up specially in 1st half and could have been much more organised. Sadly The movie fails to create an impact we all were expecting.
I will not give spoilers. Go watch the movie and find out yourself.