I have no problem with 'brainless' action / monster movies, as long as they are done right. The first Meg was a decent enough bit of entertainment. The sequel is a very pale immitation.
There are is a pointless eco=polution sub-plot that I assume are included to pad out the story. They add nothing to the story, plus they are really badly done with obvious villains who are revealed too early and have very predictable deaths.
As other reviews have pointed out, what little Meg action there is takes place in darkness with average cgi. The acting is phoned in by most of the cast.
The movie kicks into overdrive in the last act, where all hell breaks loose and we get a series of multi-monster / bad-guy action scenes. Even here, all logic goes out the window.
It also doesn't help that this was made before the events of the Titan submersible disaster and anyone watching this will have a passing knowledge of the effects of incredibly deep submersion on the human body, so the entire underwater action in the first half is ridiculously stupid.
This just isn't silly enough to make it worth a few hours of your time.
