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.
There's actually an ingame sidequest where you help Bling Guardian themselves prepare for their tour's last concert. Their last performance is an actually ingame cutscene of them performing the gam'es Leitmotif, and it is glorious.
Game Breaker: The Battle Mage in Sacred and the Dragon Mage in Sacred 2: Ice and Blood are commonly seen as ridiculously overpowered by many players, as they are incredibly versatile Kung Fu Wizards (and one of the can turn into a dragon).
Actually, Sacred Underworld toned down the Battle Mage... but then introduced another rather overpowered character, the Dwarf.
Goddamned Bats: Goblins and Bandits in the original. Kobolds and Rats in 2, especially Rats.
Let's just say female Sakkara Priests as a whole. Their cries of PRAY FOR FORGIVENESS!, as well as death screams are going to drive you nuts after hearing them for a hundredth time.
Nightmare Fuel: Underworld. The opening alone has Vilya being Mind Raped by Anducar with vision of Valor's death, as well as him unleashing his demonic servants on Ancaria.
Player Punch: The first game has Prince Valor's death at the hands of Shaddar.
That One Boss: The Ghost of Christmas Future. It has a devastating damage output, is surrounded by Elite Mooks and has the ability to summon more of them, it barely takes any damage at all from non-fire based attacks, and it has an obscene health regeneration. Oh, and it automatically scales to your level. Have fun!
The Community Patch brings us the Succubus, who will fuck you up if you're not adequately prepared.
That One Sidequest: The Hunting Fever chain from Ice and Blood. You have to hunt down and kill an ungodly amount of very specific enemies under a ridiculously tight time limit. Even the official wiki lampshades how absurd it is.
The Shadow Warrior can be considered this, especially in the Light campaign. After having died an honorable death in the service of his country, he was at peace and enjoying his final reward in the afterlife, only to have it all stolen from him and forced back into the living world by the Inquisition, who wish to use him as a tool in their world conquest scheme. In the Light campaign, because he has retained his free will and noble spirit the inquisitor who revived him dismisses him as a failure and casually orders his death. When the flunky fails, he shrugs it off and refuses to send him back to the afterlife, instead suggesting that the high elves may have a use for "a rotting zombie like [him]."