I agree. Also Sandler's goofy shtick doesn't work well with dark themes. A different actor/writer could have done it justice.

The movie would work much better as a dark comedy, but Sandler doesn't really do those. Also think the movie would have been much more effective at the message if they didn't end up taking it all back in the end- like if I'm remembering correctly he ends up going back in time and gets to fix all his mistakes, completely defeating the purpose of the message in the first place.