We should differentiate between romantic Gary/Mary Sue stories and business/world building types.
While a romantic *Sue character is more appreciated here or on other sites like Sol because of the whole sexytimes material, most readers are probably looking for more nuance. Unfortunately, many authors try to overdo the anti-Sue-ification of their characters and overload the character with issues, faults, and burdens or let them make one stupid decision after another.
The other type is the Business type, Mary/Gary Sue. Most prevalent in Do-over or time travel stories. The drive here is the empire building of the character, and for me personally, it hasn't lost its charm.