This is actually very fascinating for me because I felt absolutely the opposite.
But first:
Pleas don't get me wrong here. I didn't write the following text to look down on you. Explaining this via text always sounds arrogant but you should know that I don't know you so I really try to summarize the reason why you MAYBE didn't see it as a good VN.
From my view Echo works if you have reflected very much on your own psychological problems, your emotional and mental construct and if you have gone through a lot of pain yourself to see the depth behind this story.
Thats why I assume it doesn't work if you haven't evolved a certain level of unconditional empathy to build this very important connection to those characters AND if you haven't understood the complexity of what it means to be human. If you don't see those levels, of course it feels boring and like it doesn't tell you anything. The story itself is packed as a pretty simple surreal nightmare but written and told in a very real and authentic way of how trauma breaks the mind. It is the huge amount of subtle details, not the haunted town story plot.
The deeper you look the more of those interconnecting details you can find and it really surprised me when I started to realize that the writers really know how trauma works.
I know not everyone can see this but the question is "Is it worth to go through this in your life to be able see it." No of course not. You can be quite happy that you can't relate to it.
That's why it is so brilliantly written for people who are receptive for this kind of story.