I have actually and for the record, the term Mary Sue has been around since the 70s
TVtropes was founded in 2004 and clearly states that it does not have notability standards for the works it covers. The content is by fans with a YMMV page for items that are deemed to be subjective
Stated at the top of the article on Villain Sues
There are subjectives, and then there are these. While you may believe a work fits here, and you might be right, people tend to have rather vocal, differing opinions about this subject.
TVtropes further states
Much of our wiki relies on the “Examples” section, where we pull our many articles together.
Interesting to note with regards to their page on Villain Sues
No examples, please. This only defines the term.
So what is it officially based on? What other character references would make examples?
It would appear that for those registered on Tvtropes, it may not be so clear either
As for notable folks in the industry, the original interpretation for Mary Sue is becoming somewhat distorted; let alone for any other version of it
A popular subject of debate pertains to whether the Star Wars sequel trilogy features a Mary Sue in its protagonist, Rey. Screenwriter Max Landis opined on Twitter in 2015 that the character fits this description,[25] claiming that Rey is excessively gifted at a variety of skills.[26] Conversely, Caroline Framke of Vox contended that Rey did not fit the Mary Sue profile, stating that “Any additional skills Rey has—mechanical work, hand-to-hand combat, climbing, etc—are explained when we first meet her… If she hadn’t picked up those skills, she’d probably be dead”.[27] Other writers, such as Tasha Robinson of The Verge , have defended the idea of Rey being a Mary Sue, stating that “for women who’ve felt underrepresented through decades where most of the ladies onscreen were victims, tokens, rewards, or shrews, it’s natural to feel a sugar rush of fulfillment over characters like Katniss Everdeen and Imperator Furiosa”.[28] Erik Kain in Forbes defines Mary Sue and argues that Rey’s abilities do not make her one, given the details of her allegedly established backstory.[29] Landis later admitted he regretted the tweet, but stood by his original sentiment saying, “I regret framing it that way. I didn’t understand that the term ‘Mary Sue’ had been co-opted.”[30]
That is, entirely your opinion. I disagree and don’t think she is
Simply put, you just don’t like her and will frame here in any way that’s in line with that dislike and resort to name-calling otherwise
Mary Sue as Protagonist You Don’t Like (Will quote the paragraph here from TVtropes)
An alarmingly widespread use of the term, and one reason a lot of people feel that the term has lost whatever useful meaning it once had. There are a lot of reasons why this usage is so common. Most obviously, as rants about and mockery of the Mary Sue phenomenon became increasingly well-known in fandom, it became increasingly easy to throw the term around as Flame bait. The fact that so many of the other definitions are highly subjective doesn’t help.
People who accuse characters of being Mary Sues rarely admit that this is the definition they’re using. The best way to tell is if their justifications for the character’s Sue-hood are all based on shoehorning, Alternate Character Interpretation, misrepresenting the sources, and Accentuate the Negative
What is a Mary Sue?
In 1976, Menagerie’ s editors referred to the original story, writing:
Mary Sue stories—the adventures of the youngest and smartest ever person to graduate from the academy and ever get a commission at such a tender age. Usually characterized by unprecedented skill in everything from art to zoology, including karate and arm-wrestling. This character can also be found burrowing her way into the good graces/heart/mind of one of the Big Three [Kirk, Spock, and McCoy], if not all three at once. She saves the day by her wit and ability, and, if we are lucky, has the good grace to die at the end, being grieved by the entire ship.[6]
No matter which way you want to spin this, the facts with Sylvanas are
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She isn’t young by any measure
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Has been part of the game and it’s history for a long time
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Worked her way up in an elite fighting unit and later went on to lead it
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Been in multiple wars, highly combat active for years in life and after
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Died defending Quel’Thalas
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Turned into a Banshee, enslaved and tortured by Arthas
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Has known both success and failure
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Has done both good and evil things
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Has people that like and dislike her (no matter the end)
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She made a deal with Death, an entity to which even N’zoth does not compare