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.
Big Lipped Alligator Moment: Stella's song, "Come Fly With Me" in Wings Of Change certainly qualifies. Including sudden change in lighting and even background singers and dancers coming out of nowhere! Most of the songs are portrayed realistically (except Muru's in Wolf Quest, but he's a spirit so its justified), her's...not so much...
Broken Base: The sequels are either considered surprisingly decent or plain bad fanfiction.
Critical Dissonance: Balto recieved mixed reviews from critics, but is generally loved by its target audience.
Crowning Music of Awesome: The soundtrack by James Horner for the original movie is absolutely stunning. Just try and listen to "Heritage Of the Wolf"  without choking up. "The Journey Begins" and "Balto Brings the Medicine!" deserves a mention too.
Not to mention Steve Winwood's "Reach For the Light" 
Draco in Leather Pants: Steele and Niju, despite being the Big Bad of their respective movies, are quite popular with the fanbase. Niju has the excuse of just being afraid of losing his home, Steele is a bit harder to justify. Still, doesn't stop plenty of fanfiction and fanart showing Steele performing a Heel-Face Turn and Niju paired with Aleu.
Ensemble Dark Horse: Star from the first movie. Sadly, he wasn't in the sequels. Same goes for Kaltag and Dixie as well.
Besides Kodi and Aleu, Balto and Jenna also had other puppies (named Dingo and Saba in the credits); we only see them like in two minutes of the second sequel (there's not even any consensus on which of the puppies is supposed to be who!), and yet they are very popular in the fan base.
Moral Event Horizon: Steele is an arrogant blowhard in the opening of the first movie, but he sails over the line into evil when he deliberately sabotages Balto and the sled dog team's efforts to reach Nome, thus endangering not only the sled team, but the dying children who desperately need the medicine being delivered. And all of that was simply because Steele was embarrassed by Balto trying to help Steele's team, and then forced to take it over as a last resort.
Nightmare Fuel: The fight with the giant grizzly is actually pretty violent.
Also Nightmare Fuel in that it was Diphtheria that the kids had. Diphtheria is actually pretty scary.
The closeup of the coffins the carpenter is building for the kids.
Ship-to-Ship Combat: Dear God, the fight between those who pair Balto's son Kodi with Dusty (who already has a love interest, according to the director of the second sequel and to her interactions with Ralph) or with Kirby is still going on!
Tear Jerker: Say what you will about Wolf Quest. The ending, where Balto and Aleu part ways over an instrumental "Someone Who Loves You", tugs on the heartstrings.
From the first movie: the little coffins. Granted, no one is actually dead yet, but that was such a horrible sight. To make it worse, the man making them is the same carpenter that made a sled for Rosie and was so delighted to see how happy it made her. Just thinking about how he must feel knowing she and so many other children might be buried soon and he's the one building the caskets...
The Woobie: Star from the first movie. It's impossible not to just want to hug him after Kaltag keeps hurting him.