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.
In A New Beginning, Earth element, specifically it's sub elemental shot, is insane. You don't get it until just before the Very Definitely Final Dungeon, but if you've been saving your EXP for it and put it all into the sub-shot of the element, it makes it a complete and utter joke. The sub element is a tornado shot that, on it's highest level, can stun even the larges enemies into the air while doing constant damage to them. This alone doesn't sound too broken, but add on the fact that it can do this to multiple enemies at once, and the fact that doing this causes them to drop spirit gems which recharge your mana while their still alive, when normally they don't do this until you've killed them, and you have an attack that not only stuns all enemies in the general area and keeps them from attacking, does constant, high damage to them, but also recharges itself for basically no cost at all. Once you get it, pretty much the only strategy for the rest of the game is "use tornado, wait for the attack to wear off, use tornado again" until all enemies are dead. The basic breath also does high damage to, but isn't as broke due to the fact that is also does high damage to your mana...
Electricity is also broken in A New Beginning too if you know how to use it, on top of the fact that you get it pretty early on. On paper, it's an element that let's you stun and toss enemies, while not doing much damage. Doesn't sound too spectacular, until you realize that enemies in this game take Fall Damage, and often get One Hit Killed even when falling off short drops, and when you throw them into bottomless pits, you still get their spirit gems regardless. If you level the basic breath version of it up all the way, you can toss even the biggest of enemies off cliffs and ledges, killing them instantly, making it amazing crowd control when the game starts getting spam happy with enemies.
In Dawn of the Dragon, Cynder's Shadow element has a basic attack that uses almost no mana, is inordinately powerful, and can hit every enemy in a fairly wide radius around her. The second is the Roll ability - its intended purpose is to quickly dodge powerful attacks, but you are invincible whenever you use it, to the point where an Earth Golem can smash its building-sized hand down on you, and if you roll you take zero damage. Using these two abilities in conjunction with each other can potentially get you through the entire game without ever dying, or indeed without any kind of a challenge.
The Shadow Strike ability deserves a little elaboration. Not only does it hit everyone in the vicinity, but it will knock the smaller enemies into the air for several seconds, and then they will spend several seconds after that getting back up. And if that wasn't enough, the shadow "blinds" them and makes them start attacking each other. If one uses this ability right, you can get a whole room full of enemies all attacking each other without you ever entering the fray.
Good Bad Bugs: The Eternal Night has a bug where, if you use an element while time magic is up, it slows down the mana consumption while using the element, but the element's attack still does the full amount of damage to the enemy. This is a really useful bug, considering The Eternal Night can get brutally difficult at points.
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.
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.
Vindicated by History: Granted, there's still quite a bit of a Broken Base when it comes to this and the Classic series, but in general, a lot of the debate and arguments over this series have died down since Skylanders became a thing, with even quite a few Classic only fans willing to admit this trilogy is at least better than it, if only because it actually stars Spyro instead of him being a side characters in his own series.
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!