Vince is right, there is nothing to argue about. Not only was the freestyle "not good" on the basic levels freestyles are usually judged on (delivery, wit, hot lines, etc), the reaction to it is one of many examples of white privilege. The issue isn't that the the freestyle has been viewed many times - Eminem is one of the most popular rappers in the world, of course it was going to go viral; Jay-Z, Kanye, Kendrick, etc could have done something similar and also received breathless coverage. The issue is the tone of the coverage, which not only hails Eminem but pretends like no one in rap is doing what he's doing, or capable of it.
Eminem has not only been making tepid to outright terrible music for nearly 15 years, he has shown little to no growth as an artist. He's rapping over the same basic production (in fact you could argue his production is worse now) about the same subjects. Namely, drugs, violence (against women), and various forms of childish humor. His "technical" masterly largely boils down to rapping like Redman or Kool G Rap or Nas/AZ.
He's a good guy who does a lot for the community in Detroit, so I don't want to make it seem like I'm shitting on him personally. The problem is moreso his fans and the media. It's amazing how many (most?) of his fans are proud of not listening to any rap outside of Em, yet they pronounce him the greatest rapper ever. Fuck outta here.