I don't think it is incredibly different. It's just not an especially effective take on the same basic formula.
Well yeah, obviously if someone just finds this superhero movie less effective than others, there's not much one can argue with there.
Part of me wants to believe it's simply fans' hatred for Reynolds and the CGI suit that's coloring their judgement of the movie... but then I remember that most of the critics (who don't give a crap one way or the other) hated it as well. So THAT theory's out the window. lol