Not an instant classic, but a lot of fun to watch. I think you can summarize it like that. The main actors are doing a great job selling the very silly idea of time traveling with or rather inside a hot tub! If you get sucked into that, everything else will work too. But if you don't like that general idea ... Maybe you shouldn't watch the movie after all and save yourself the time (and grief).
It's hilarious and it has heart, even when it's gross at times. Which it can be, but it's easy to tolerate and forgive it for those little moments, because it actually is funny. Trying to figure out how it actually works (the physics of the time travel) would probably lead into a territory the movie would not want you to go ... and why would you want to ruin your own enjoyment ... if you're having fun watching - stick with it
It's hilarious and it has heart, even when it's gross at times. Which it can be, but it's easy to tolerate and forgive it for those little moments, because it actually is funny. Trying to figure out how it actually works (the physics of the time travel) would probably lead into a territory the movie would not want you to go ... and why would you want to ruin your own enjoyment ... if you're having fun watching - stick with it