impressionism is a style. when the first impressionist works were introduced they were art, and it is still considered an art if someone introduces something new and creative using impressionism or a mix impressionism and other styles. (but if i draw some impressionist work today which introduces nothing and contributes nothing new it is not art, if my picture looks alot like old works from famous people or and has little to know new things from me it is not art).
But, I have to ask this once again from my mentor. cuz i think somewhere someone in the class mentioned nowadays there's no "pure" style anymore. you can't be 100% impressionist if you want to be considered an artist, I'll ask him during the next session. I do believe that many art pieces are just random junk thrown by artist wannabes, but there are also some rather bizzare and weird stuff which are truely art. but they're kinda weird so many people view them with scorn.