Meg 2 doesn't really feel like a follow up film, to its 2018 counterpart. Indeed, the latest instalment feels more like a platform for various action "stunts".
The giant,prehistoric shark's are essentially window dressing, for a variety of frenetic action sequences, where things blow up, are torn apart, shot at, harpooned, people gobbled up Jaws and Jurassic Park style and what I can only describe as acrobatic, aquatic scenes with jet ski's and the like, all take place. They even throw in a giant squid, to spice things up.
Or put more simply, this is a messy mash up, of derivative, often dispirit ideas. Unsurprisingly, the results a bit chaotic, with no compass to direct the viewer, in terms of the story, such as it is. Its quite watchable, in its own way but it never really goes anywhere.
In summary, watchable on a very visually superficial level. Lots of action but little in the way of an established story, to pull the whole thing together.