1) Criticism of the art industry and it's role in the commoditization and market making you mention around art. That isn't criticism of art or it's value...it's criticism that such value is often interfered with for, among other things, money laundering.
2) Criticism of specific pieces of art that an individual doesn't 'get' (and by golly I fall into this trap). By get, it really is about they don't see the artistic or cultural value of that piece but typically is done in reference, which implies that they do see some art as having value.