I'm no shark expert, but it looks totally real to me. Great whites aren't very flexible creatures. Were you expecting Yoda-style backflips? That little bit where it jumps out and kind of flops about for a while just doesnt cut it. Not to mention the pretty comical rhythmic biting. It looks like the semi malfunctioning rubber robot it is. When I watch it now, it seems to me as if Bruce jumped out of the water, then went 'oh shit, I'm stuck'. All is good after it bites Quint tho. That said, its probably that jarring because all that came before it was so good. There was no CGI replacement But they did redo the sound effects