When you actually get down to it, all of the sequels after the original film deviated from that original concept.
Before DH5, Die Hard 2 was the worst, IMO. The original was very sucessful and they greenlit a sequel as quickly as possible, but they had no clue what to do, so they did a slighty different take on the same film, with all the same beats. Die Hard 3, IMHO, was perhaps the second best.
That's when they ditched "the one man in a messed up situation" for "McClane having a partner going through the same messed up situation", but in that movie it worked. Die Hard 4.0's biggest mistake was having a PG-13 rating.
But it still had just enough amount of fun, tension and excitement that was clearly missing in A Good Day to Die Hard: The characters were dull, the jokes were very flat and the characters made it through everything.
Out of respect for a family member, I won't disclose as to how or why I watched Zookeeper. It's been a while since I watched a really, really bad movie. And I got what I deserved by watching a Kevin James vehicle. Apparentely I was lucky for never watching Paul Blart: Mall Cop, but this one... I can't think of anything remotely funny or clever to say about it.
It's bad, but sadly not the kind of bad that you can still enjoy on some level, on the contrary, it's that type of bad movie that makes you rethink the choices you've made in your life. Maybe, kids and teens might get a chuckle out of the idea of having animals say silly lines here and there, everybody else,
stay away. It's dull, it's unfunny and the ultimate message of the film is absurd. Yuck!