Yawn I just watched this for the first time last night. It's interesting that several reviews her express the notion that "Jill St John starts off feisty, then regresses to a simpering mess."
That also describes her character in "Diamonds are Forever" exactly!
Also, if the point of going there was to verify the professor's claims of seeing dinosaurs on an earlier trip, why do they set their helicopter DOWN ON THE GROUND in the jungle, without more extensive aerial surveying of the limited-area jungle plateau first? Soon after they land, (and scatter from their only means of escape (the helicopter)) the dinosaur attacks (you don't say?) and crushes their chopper. (I could have predicted that before they left London!)
I'll give it a 3 - for eye-candy reasons only.