Just my 2 cents, and keep in mind that I am a mk fanatic.
umk3 is neither popular, nor a classic by most people's standards.
It's too new to be considered classic by age, and it's otherwise the most forgettable in the mk series. Even in the arcades, it was the least popular of the mk series.
Umk3 was a quick fix to a rather bad mk3 release that, while well recieved by mk fans, went unnoticed by the general public.
And remember, I love mk games.
Also the glitch doesn't effect gameplay and is only visible for a few seconds. It's not a major issue imho.