What was the first thing which made me rush and watch the first-day-first-show of this movie? It was the fun-factor which is quite evident from the official website of APKGK (http://www.ajabpremkighazabkahani.tips.in/). The other interesting features were the songs (i love most of them).
The story is of a good-for-nothing boy (and his equally worthless friends) who promises his mother that one day he will do something great and make her proud. There are many sub-plots in his way to fame. And of what value is fame if you don't have the love of your life by your side by the end of the story? Prem succeeds in achieving everything (like in most hindi movies).
I got slightly bored with all the slap-stick comedy in the first 15-20 mins. But slowly the movie got interesting. May be I liked this movie so much because I really wanted to like it as it reminded me of those good old movies Andaz Apna Apna, Jo Jeeta Wohi Sikander and Kabhi Haan Kabhi Na. Amongst them the resemblance to Andaz Apna Apna was most obvious (with Ello ji sanam hum aa gaye playing in background in of the scenes) , specially the climax which was shot in a detergent factory. The villain would remind you of Crime master Gogo. In one of the scenes he calls to ask for ransom money (yes the movie has a kidnapping) and the call gets cut because he was low on balance... :)
Both Ranbir Kapoor and Katrina Kaif look cute and act funny. The supporting cast all fit well in their roles. Smita Jaykar (the Ma) did a cute-trying-to seduce-her-hubby scene which made the public split into a roar of laughter. There are many funny moments in the movie (more in the second half). I will not write about those here and let you all enjoy the Ajab Kahani yourself.
I like the song "Tu jaane na" most and it is picturized well too (in blue tint). Other songs are also good to listen to, like "Tera hone laga hoon" and "Prem ki nayya".
Overall I really enjoyed this movie. A simple funny cute movie.