As I've said before, the TM is a dispiriting place to visit, it's the pokiness of the galleries compared to the scale of the building, its the escalator layout which always dribbles you out on the level which you don't want to be. It's the feeling of being processed rather than free to wander amongst great art.
Malevich wasn't very good at painting, in the sense his stiffly painted surfaces cracked, and his shapes often look more chosen than felt. He was a very good artist despite his lack of facility. My favourites are the ones made under the doomy days of stalin, where he incorporates abstraction into the clothes of his usually faceless figures. The rest of the show looks like he's trying out (possibly inventing) the modern styles. The wall plaques plumb new lows of banality: drawing as a tool of thought, faceless peasants representing oppression... my paraphrases are pales shadows of the awfulness of the originals.