It would be an incorrect usage of the term "hack," though. It doesn't mean "bad artist." It means artist who literally doesn't give a shit about the work he's doing. A hack is a pure mercenary, basically. He comes in, does the work, doesn't put any extra effort into that work, and cashes the check. That's a hack. Hackwork isn't bad. It's just plain and absent of any artistic integrity or aspiration.
Abrams obviously gives a shit, and is aspiring to a certain level of artistry. Whether he hits it or not is up to the viewer, but he's definitely not a hack.