Do you seriously not see any kind of visual appeal to any of them? Well, ok, I'll try to explain.
Abstract art, despite what you seem to think right now, is not devoid of skill/talent/thought. If a work of art is not concerned with depicting reality and the human figure, it does not mean it is devoid of any quality. Just like good figurative art, it greatly considers composition, color theory, space, form, texture etc.
Have you ever tried to create an abstract piece? The majority of the pieces in this thread are quite hard to pull off even in terms of brushwork, let alone anything else. Have you ever seen what paint applied to canvas with a brush without any thought looks like? It looks extremely dull, messy and boring. To achieve the effects displayed here, one needs to scrape, layer, drip and all sort of other shit which, if done without experience and purpose, always leads to a big mess.
Pic related is an example of bad abstract art and you can use it for comparison. It's a perfect example of what you'd find in a run of the mill 50$-a-piece local gallery run by a single mom. It's just lines, all of the same thickness, spread around and colored shapes in between. Primary and secondary colors, one layer. The composition is completely static and the work in general is completely dull despite the use of wild colors and curvy lines.