Not that deep...
First things first. Where is the spirit? Where is the budget? The new set looks like a cheap metallic backdrop. At least, the action is confined to an underwater station, once again, and that’s what ties the two films together. The aquatic photography doesn’t look like stock footage, and it’s the best thing about the movie. If it's gore you like, expect plenty of it.
The build-up almost always sucks. Deep Blue Sea 2 is so close to the original installment, beat by beat, yet oversimplified to accommodate the budget, that it’s not worth the average viewer’s time and money investment. This is a pocket-size, cut and paste version of Deep Blue Sea, where everything is smaller, dumber, less ambitious and less impressive.
The use of integrated graphic design to simulate drug hallucinations is ludicrous. You need to see it to understand how stupid it looks. The stimulants, as described by the characters, are “compounds that can accelerate evolution” ... something about anti-bodies tested on bull sharks, and a lot of mumbo jumbo. Deep Blue Sea 2 is one notch above Sharknado, perhaps, but it sure isn’t Jaws.