The main problem with Tintorera is that it doesn't know what sort of film it wants to be. Piggybacking on the success of Jaws, it promotes itself as a killer shark movie, but this aspect is almost secondary to the peripheral shenanigans that ensue, including sex, nudity, swinging parties, disco dancing and a polyamorous affair with Susan George!
The underwater cinematography is impressive and the shark attack sequences are quite intense, with one attack in particular being genuinely visceral (you'll know it when you see it). However, these moments are too few and far between.
A word of warning: There are several brutal shark hunting scenes featuring footage of real sharks and other marine life being speared and clubbed to death which I found difficult to watch.
Tintorera is worth seeing, but cheap copycat films such as this really only serve to establish what a genuine masterpiece of cinema the original Jaws actually was.