These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Visual Effects of Awesome: Yeah, yeah, this is taken for granted most of the time, but it still applies pretty spectacularly to this show
Special Effect Failure: But while the graphics are mostly a delight to look at, some of the backgrounds are too obviously CGI (even when the creators' intention of creating slightly fantasy-esque, moody backdrops is taken into account), and the jerky and stiff animation lends no credibility to the animals as massive, multi-ton beasts.
Interestingly, by far the most common complaint leveled against the program is that "the CGI sucks". Many people compare the effects unfavorably to those of WWD, despite that the latter show used real-life backdrops, so it's only natural that it would have also looked more realistic. Again, the faulty animation and some bizarre directing choices (there was no need to Undercrank all those scenes or keep the camera shaking) has a lot to do with this, but the CGI animal models are, from a technical standpoint, infinitely superior to WWD's. See Tough Act to Follow above.