Why compare this to the original?
I'm assuming King just wanted to give the fans of the book, myself included, a better representation of what happened in the novel. I don't know if I could say it can stand on its own merit, really, but when I saw this at age 10 it terrified me. The 1980 version stands on its own for sure. It's wonderfully done and very frightening. Jack Nicholson is one of my favorite actors.
I do have to admit, though, that Shelly Duvall irritated me. Her personality was nearly nonexistent and her character just seemed rather pathetic. Also, the scene with Jack and the woman in the tub just seemed ridiculous. In this version, there are many scenes where Courtland Mead (Danny) was irritating as well. But, he definitely had more of a personality than the actor from the 1980 version, who also bothered me.
Anyway, I think it's safe to say that this version was simply a nod to the fans of the book. It was definitely not perfect and a lot of the fearful and gritty horror that the book provided (all the descriptions of the Overlook's whispers and screams gave me such chills) wasn't there, but I enjoyed there being more detail. I like that King has many mini-series since they have more time for detail development, yet they could always be done better.
I enjoy both for different reasons and believe comparing the two to the point of bashing others' opinions seems like the whole Comparing Apples to Oranges cliché. Comparing it solely to the book seems like a better deal.