Everyone has a right with regards to their opinion; whether they like it or hate it i'm not judging. Just thought i'd put in some of my own effort to write if its good or bad.

For me I personally felt that Boku dake ga Inai Machi is a worthy manga to check out. Especially for fans or people interested in the Mystery genre. Without being to bias, I try to think more on the good things of what the author is trying to do.
How they want to perceive or show off their story.

For many who have even seen the anime which just started this season; The first episode does indeed give off a pretty strong and lasting impression.
There's a clear path of where the plot is heading down which will lead us asking and wanting answers to these mysteries.
It left me highly intrigued and decided to read the manga. (I binged it, lol)
I do believe this series will catch people's attention and interest.

After reading each chapter i'm left wanting more. Capitvated and hooked.
How can the main character solve this? (Who, what, why, how, where, when, with what)
Strong feelings of suspense, exactly what I would want in a Mystery.

Now some things can be seen as cliche or "I knew it"; I don't find that too much of a problem here.
You have a good story here, with foundation, twists and turns. One or two cliches shouldn't deter one's opinion too much from liking it.
(Compared to a lot of other cliches that happen in fighting/shonen mangas no offense still love those)

My review is based on how much I've read which does include the raws.
Pretty grateful that my curiosity got the better of me and I gave it a go.
I have very much enjoyed reading it so far and hope that my review was of help for those interested. Boku dake ga Inai Machi's anime is definitely gonna be on my radar for watching.
Giving this a 9/10. (10/10 = me very bias which I want to give it that haha)