Honestly, it all comes down to the originality. There is nothing original in the above trailer. And as good as McCarthy and Wiig are, they are no match to Murray, Aykroyd, Weaver, Ramis and Moranis.
Since Reitman is involved, I'm hoping that they're simply not ready to show us the good stuff. In the meantime, let's go back to the source.
https://www.youtube.com/v/teGxHLo9QccT