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.
Critical Dissonance: Dawn of the Dragon especially. It was the worst-reviewed of the trilogy and got very middling to bad scores from critics. However, it seems to be the fans' favorite game in the trilogy.
Fridge Brilliance: Malefor's army giving up the siege on Warfang seems a bit sudden after the Earth Golem he sends out is defeated, but given that we later see how much he enjoys messing with others, he probably called the siege off before summoning the Destroyer was probably to make his enemies think they were winning before he showed them that the outcome of the siege made no difference.
Hype Backlash/Critical Backlash: Both are equally possible. If you listen to only the fans who adore the trilogy to pieces, you'll probably be disappointed. On the other hand, if you listen to only the haters, you'll probably be pleasantly surprised.
Mary Sue: Many fans of the old series find Cynder to be this.
Scrappy Mechanic: Lets just say that thanks to the block/evade system, some people with the Wii version of Dot D demand to know why support for the classic controller wasn't implemented.
To elaborate: in order to block you have to hold the Wii nunchuk vertical, and dodging requires you to point the analog stick in any direction and flicking the nunchuk in the direction you want to dodge. As you may expect with orientation based controls, it has a habit of activating at the worst times, or failing to do so when it's needed. And the fighting system relies heavily on effective use of this mechanic...the classic controller has the same amount of buttons in the same orientation as the PS3 controller.
The Woobie: Both Spyro and Cynder, though Cynder arguably has it worse than Spyro. Spyro no doubt suffers greatly throughout everything and ultimately is pushed across the Despair Event Horizon by Malefor, but Cynder's life in general has been one long living nightmare. She was Brain Washed And Crazy for most of her life into doing unspeakable things to her own kind and when she's finally free, she remembers every horrible thing she did during that time and feels guilty about it all (and she's a 12 year old kid at this point!) to the point she runs away from her friends and home because she can't stand it anymore. Not to mention Sparx being a pretty big Jerkass to her. And in the third game people repeatedly continue to blame her for what she did under Malefor's control, including the Hermit scene which seems to exist only to show the fate of the Apes and make Cynder suffer. Finally, she ends up getting sent over the Despair Event Horizon by Malefor as well and gets Brain Washed And Crazy all over again, forcing her to attack her own love interest! At least Spyro had a loving adopted family to help him through it all!