I certainly expect the Rexes to be underwhelming when compared to the behemoths that were the Kenner Rexes (I still want the Bull Rex that eats figures. I never got one when I was a kid, and I really hate that I still don't have it) and there were of course a few other dinosaurs they did well, but not every Kenner mold is fantastic. A lot of stuff was out of scale even back then (although Kenner certainly tried a lot harder to keep scale than Hasbro did with JP III). For example, the old Kenner Spinosaurus was terrible. The snout is wrong, it's way too small, and the legs are sculpted in a dynamic pose that makes getting the thing to stand up properly difficult. There was also an enormous figure of the pachycephalosaurus from The Lost World that I thought was weird because the one in the movie was much smaller. Then there is the Lost World allosaurus. It's really cool, but too small. The carnotaurs for both lines have inaccurate hands/arms, and are both too big for their scale (but still cool, especially the JP I version).
With that said, from what I can tell, it looks like the Jurassic World line will be an improvement over the terrible JP III line, which had out of scale dinosaur madness that still does not make any sense, and human figures with terrible actor likeness (a problem in the Kenner lines too admittedly), terrible accessories (push rockets? really? the figures can't even hold them!) and some figures were characters who weren't in the movie who can't stand up (The JP III army general is one of the most weirdly sculpted action figures I've ever seen. His arms are sculpted to hold his push rocket gun, but his legs are sculpted in a dynamic pose that leaves no support for his center of gravity, causing him to fall over even when he isn't holding anything.) Furthermore, the first two movies had toy lines that had a plethora of humans, JP III had very few in comparison. It looks like Jurassic World is only going to have a few different Chris Pratt figures.
Looking at some of the Jurassic World Dinosaurs though, one thing that I think will continue to be an issue is their inability to stand up. Their sculptures, just like with JP III, have gone mad with the dynamic pose thing, and getting the dinosaurs to stand will most likely be an issue. Expect Raptors to be on all fours with their ass in the air, and T-Rexes laying on their sides.