All these reviews are nonsense. A great movie with an interesting storyline, it does an especially good job at preserving the iconic mysterious and adventurous vibe and the not-so-witty (but dead funny) humour we've all fallen in love with the Pirates of the Caribbean for, to the point you kinda start having a very profound sense of nostalgia for those first few movies.
The characters are all also relatable and fit very well within the franchise, and the ending was well thought-out, potentially leading up to a next sequel (?). Either way, even if this was the last movie, you sure will leave the theatre unable to wait for the next movie to come out.
Overall, don't trust the reviews and just give this one a go - you won't be disappointed.