In line with the question above, I'd like to hear your thoughts. There are no right or wrong answers here, just sharing your opinions.
All forms of creative expression are worthy of being called "art".
Whether they are "Good" or not is purely subjective outside of the extremely rare, genre-defining and timeless works of legends like Tolkien, Rice, Shelley, Lewis, LeGuin, and many (many) others.
What I tend to look for though, is originality of style and authorial vision. The clarity by which this, and your authorial intent, are conveyed is what serves as the bar for quality (in my opinion).
If you have that vision, and intent, you have art.
I would personally like to consider my own works as fairly decent quality overall. That said, I am sure there are those who will love them and laud them as the best things they've ever read, whilst there are surely just as many out there who would call them the worst crap they have ever had the displeasure of looking upon, along with a whole spectrum of opinions in-between.
That's also part of what it means to be a work of art though. You get four people in a room to observe/read/view the work of art, and you end up with five (or more) opinions on it.