De Dana Dan delivers exactly what it promises. It takes the Hera Pheri genre, or more generally, the mindless comic caper category and introduces the "speed" element in it. Literally, De Dana Dan is comic events happening at dan, dan - breakneck speed.
On the positive side, the movie is fun to watch, and does not deviate from the formula. Each actor, each character, and there are at least 20 characters (with significant roles) in the movie, play their part well. Of all actors, Johny Lever, and Asrani are probably the best in their parts. Paresh Rawal has done well too. Akshay is now a regular at this theme,he does excellently well in his role.
The story line is thin overall, but given the complexity (it is really complex) of the 20+ characters - one really finds it difficult to follow the happenings in the movie. the immediate part (about 60 minutes) after the interval is simply mindblowing. the climax is shoddy.