Its a format which has been done to death.
This particular film starts off bad and gets no better.
You may well enjoy this film if you have had a lobotomy at some point.
If there is a tragedy in this film, it may well be the destruction of a speedboat,
Think Piranha, which was only held up by good acting and a good budget, and the few college kids off for a weekend at a lake, then throw into the mix, bad acting, a very weak plot, a storyline which desperately tried to find something more than a shark attack to make it even slightly entertaining, and you have shark night, possibly the biggest turd to have been excreted by Hollywood in recent years.
It is quite literally a couple of hours of your life you will never get back and will regret wasting.