World War Z isn't terrible to be fair to it. It's just not *good* and could have been.
It's more frustrating that it's not better than particularly bad.
Probably worth a watch if you're after that particular kinda thing and going in with low expectations will help.
Tangentially related: I enjoy Best of the Worst quite a lot.
https://www.youtube.com/watch?v=q6TY-nBkxqY&list=PLzcqBM3nee_yh15M3pe76a_Bm3AjCqnkZ