This and the fact that they also try to focus more on movement , again the t-Rex from JP compared to T-Rex in JW. It seems like they wanted to show the dinosaurs moving faster in attack mode trying to capture more realism like a actual dinosaur fighting another dinosaur ( ex. T-Rex vs Hybrid T-Rex in JW ) that when the CG starts moving to fast that starts to took distorted and simpleistic and turns out to look like bad claymation at times.
Yes, they all look like rubber dinosaurs with no weight to them. They also don't blend with anything in the scenes they're in. Just look at the final fight with the two Rexs and look how awful they look. There's no sense of tension since the CG is so bad.