To be fair, The Shining didn't get a positive reception when it came out. It took years for the movie to be reevaluated as a Horror classic.
I got to see the remastered version in theaters a few weeks ago and besides Jack Nicholson's tour de force as Jack Torrance (everybody was good including the kid actor), I must say I got to enjoy Shelley Duvall a whole lot more. Her performance is much more subtle than Nicholson's because her character, Wendy, internalizes everything. She's trying to make the household as tension-free as possible because she's scared of her husband so she comes up with these cookie cutter comments but everything she does or say irritates her husband.
One scene in particular which had me near tears was when Wendy sees Danny from afar while Jack is breaking down. In her mind, she's trying to keep Danny away so as to not irritate Jack more but as she comes closer to Danny and sees the bruises in his neck, she explodes. She lets Jack have it after weeks of trying to keep the peace. All the fear and tension was gone because now all she could see was her kid is hurt and visibly traumatized and she wanted to rail against the man she assumes hurt him.