You will probably differ from this, but all to our own.
The much loved The Hangover was a terrific movie. You may disagree that The Hangover 2 was disasterours and unoriginal, but think about it, there are more things wrong with it than right.
Now, the other day, I had a hangover day, literally, I was and I watched. I felt, after seeing the sequel, that it was crap, however, on this day, something magical happened - I watched the first film, and the sequel right after, and I rather enjoyed it! I have a theory that as the first film is so enjoyable and the cast, so likeable, we are excited to see them in action again, and so the sequel benefits from this. Trouble is, it was released almost two years after its predecessor, so I think people will have forgotten the magic, and film is then overlooked.
Have a Hangover day, see how you feel.