I picked up the Deep Blue Sea trilogy just before my birthday. In a pique of lockdown frustration, I ended up watching all three yesterday. These aren't particularly deep (heh) films, so I'm not going to say too much about them.
Deep Blue Sea, still not a bad film after 20+ years. CGI still largely holds up today.
Deep Blue Sea 2 - despite being made in 2018, the sharks look worse. Plot is essentially the same, almost making it a remake, "Oh we're making a new drug. Lets genetically enhance sharks to make them smarter!" Definitely the worst of the 3.
Deep Blue Sea 3 - Not a bad film, but that's not really saying much considering how low a bar the second film set. Tries to be a little different, both in terms of location and general problem, which helps it stand apart from the previous films. Still not as good as the first one.