I made a mistake. I watched this mess of a monster movie while comparing it to the original THE LAND THAT TIME FORGOT from 1974 - a decent enough film with stop-motion monsters, as is THE VALLEY OF GWANGI (1969) which is where the last T-Rex scene in Jurassic Park comes from and other scenes too. My bad.
This is truly atrocious - I tried to like it, I really did, as I adore dinosaurs and dino films too. Some low-budget modern ones are great like THE DINOSAUR PROJECT - a British found footage dinodrama from 2012.
I laughed out loud several times. The acting is so hammy it could feed everyone on that tropical island for 65 million years and often so wooden they could build cities of houses with it too. The German WWI submariner is pure Herr Flick from ALLO ALLO, 1980s WWII TV sitcom. Unintentionally funny.
The CGI effects look cheap - the original Jurassic Park only had dinosaurs on screen (CGI and models) for 6 and a half minutes. The rest was building tension, sounds, rustling trees, impact tremors on a glass of water etc. Learn from that.
As for the plot? The 1974 original film's plot MADE SENSE despite the hokum. This? Even the actors look like they cannot believe they are spouting such badly-written nonsense. The producer of this has form - loads of cheaply-made monster movies etc, so obviously they earn cash on DVD releases.
Do yourself a favour and rent the 1974 THE LAND THAT TIME FORGOT and 1969's VALLEY OR GWANGI.
The ancestors of birds today are dinosaurs, of course, and boy oh boy is this a turkey AKA a failed dinosaur.