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.
Adaptation Displacement: Depending on where you live. The comics that the show was based on seem to have grown rather obscure in America, but in most of Europe, the comics are still far better known than the cartoon. In France, the comics are still well known while most people hardly even heard of the cartoon.
Awesome Music: Pretty much the entire instrumental score, rich with leitmotifs and themes that uplift and inspire. Pay any attention to the music, particularly during the "Treasure of the Golden Suns" five-parter, and it becomes apparent how much love Ron Jones poured into scoring this series. It's a positive tragedy that, to this day, Disney Records still hasn't released the BGM to the public on a CD collection. It's perhaps an even more appalling tragedy that even among DuckTales fans, those who pay enough attention to the score to merit a CD release comprise a very small pocketfandom.
Base Breaker: Much like the second season as a whole, either you like Gizmoduck/Fenton, or you hate him.
Broken Base: Some fans feel that season two was inferior to the first and that it had weaker animation and missed the adventure stories that made up season one. Others felt that the second season was just as strong as the first.
Ensemble Darkhorse: Launchpad, who later went on to become Darkwing Duck's sidekick. Ironically, when Launchpad started appearing in non-''WesternAnimation/DuckTales'' related comics, he was poorly received by comic readers and accused of being an unnecessary carbon copy of Donald. Which is really weird, considering that Launchpad hardly ever gets angry or complains about doing what he's told to do. Donald's defining characteristic, on the other hand, is his temper.
It's really not that weird. Launchpad isn't similar to Donald personality-wise, but the role he played on DuckTales was an obvious stand-in for Donald's usual role in the comics. Since the comics already have the actual Donald, Launchpad is a rather pointless character in most of his comic appearances. This, coupled with writers not knowing what to do with the character, probably led to some readers thinking of Launchpad as, essentially, "Donald minus his personality".
Glittering Goldie, who appeared in a handful of episodes despite only appearing in one Carl Barks story. Rosa also padded out the character a lot in comics that mostly came after the show, including his epic masterpiece.
Gizmo Duck, plain and simple. He turned an accountant into the most powerful array of mechanical components and accessories who is a bodyguard and security guard for Scrooge, as well as a super hero to Duckburg and even went on to help Darkwing Duck protect St. Canard.
Evil Is Sexy: Magica De Spell, Circe, Cinnamon Teal, and Boom-Boom Beagle.
Moral Event Horizon: Fritter O'way in Down and Out in Duckburg was already a Jerk Ass but once he discovers that Scrooge can get his fortune back he goes to where he and the others are at and opens fire on them with a rifle intent on killing them or sinking their ship.
This show was just as memetic when...THAT LOUSY, ROTTEN, BUMBLING, POLECAT McQUACK (*gasp*) LOST US THE BATTLE AT DUCK RIDGE!
Memetic Sex God: Magica De Spell, Circe, Cinnamon Teal and Boom-Boom Beagle.
Moral Event Horizon: The Beagle Boys mainly resort to burglary and thievery throughout the show, and don't really harm anyone. However, they cross this line BIG time in the series finale, when they turn Huey, Dewey, and Louie into golden statues, essentially killing them...though the effect is reversed at the end of the episode. They get their comeuppance when they suffer the same fate.
No Problem With Licensed Games: The Duck Tales NES game is very much in the running for being the best example of this trope; the game actually became a classic and is considered one of the finest games made during the 8-bit era, by Capcom or anyone. Its sequel is rare, but had similar reception. In modern times, it's ranked up along with Golden Eye 1997 and Kingdom Hearts (which is, interestingly, another Disney property) as an example of a licensed game done right.
Hell, Game Informer and EGM have BOTH placed it at #2 of all-time...
In fact, as it says on the game's page, the game is SO popular it's getting an HD remake.