You get killed, you wake up a fresh in the same morning only to relive that day you get killed one way or another? You "reset" every time.
Watch the trailer here from Warner Brothers Pictures
I asked a friend how would he feel if he would be the main character(Tom Cruise). He replied it would be tiring. I agree but you are also given a chance to change the outcome of that day. If I am given the choice, I would have used it to change a lot of things and see how it goes.
No not save the world like Tom Cruise did but maybe something on a smaller scale. Making a difference to other peoples life.
The down side? Reliving the painful part of having lost something/someone you could never replace.
All in all this movie is a 2 thumbs up from me. I highly recommend this movie.