The confidence is the problem.
You don't understand what you're looking at, you don't understand what the artist was doing, you don't understand why they were doing it, you don't understand the constraints they were or were not operating under and why they may or may not have picked those constraints. It's like looking at a Picasso and saying "well that's the shittiest bull I've ever seen." What you're doing is like watching a boxing match and saying "it's very lazy that these people aren't using their legs" or "I don't understand why that person won, they didn't even knock the other person out!". There's a thing that's happening here that you've not bothered to learn enough about to understand whether or not the participant is accomplishing their goals, because you haven't bothered to learn what their goals are or what accomplishing them would look like.
Again, it's totally fine to say "I don't like this," or "I don't understand this" (although I'm getting the sense I'm unlikely to hear _that_ from you), but to say "this lacks artistic merit" - you absolutely do not have the knowledge, background, or apparent interest in the topic to have any idea whether or not that statement is true.