And by not at least naming one of the problems, the author is being cowardly and/or lazy. It's like describing a reviewed item as "good". It conveys no information other than "I like it". The word "problematic" does the same thing here. It signals that the author doesn't like something but doesn't tell us anything about why. In other words, it's fucking useless.

I would express this as "vague," at worst, not "useless and cowardly." What is "cowardly" about it?

...which doesn't mean anything at all (unless you are quoting firefly, of course).