This is a 5/5 experience for me personally due to nostalgia, but I'm giving it 4/5 here because there are definitely some flaws.
I was the target audience back when these comics were first released. I was a Lego fan club member, getting the Lego Club Magazine every month in the mail. The Bionicle comics came for free along with the magazine, and it was always the highlight of my month getting to open it up and read the new adventures. I still have the original comics in a longbox in my closet. My friends and I used to get together to play with our Bionicle figures, watch the Mask of Light movie, and one friend even had the Quest For Makuta board game. Bionicle was an obsession, so I can hardly describe how much nostalgia I have for this series. Re-reading these old comics is an absolute treat and takes me back to my childhood in a major way.
The pacing can be absolutely atrocious. I believe this is in part because the comics are fairly short, and because there are six main characters who all share the spotlight so there isn't much time for each story when they're not together. The first few issues follow the six Toa as they separately explore the island of Mata Nui, so you end up with a lot of jumping around between scenes, and there are many times where a threat is introduced, it almost defeats a hero, then the Toa succeeds against all odds all in the span of a few panels on just a page or two. As a kid I loved this, since it felt really quick and full of non-stop action. Now as an adult, I realize this basically removes all tension. When the Toa are in danger, you know they're just a panel or two away from victory, either by their own power or by another Toa swooping in to save the day.
This is exacerbated by the fact that sometimes it's hard to even tell what's going on, because entire battles are limited to a couple panels, making it difficult to see what's happening. I understand this is a limitation the authors/artists had to work within, probably imposed by higher-ups at the Lego company (I assume printing comics isn't cheap so they probably were restricted to a certain page count per issue, and they had to progress the story quickly enough for toy launches) and they did the best they could. It's amazing how high-quality art and writing we got in these comics which were just given to us for free. Of course I understand from the Lego company's point of view these comics were advertising, and it definitely worked on me and my friends, but these comics could have been way worse if they weren't written by someone who really cared about the stories they wanted to tell.
Did you know you can access all the Bionicle comics online for free? I find that incredible. It's awesome having these as a PDF on my iPad so I don't have to drag out the big box and risk damaging my physical collection when I want to read them.
I've mostly complained about the pacing issues, but these comics have a really fun and deep story, especially in later issues. The lore of Bionicle is complex and interesting, way better than a simple toy advertisement had any right to be. Because yes, at the end of the day these comics existed to sell Legos to children. But they also captured those children's imaginations in a big way, and I honestly think Bionicle had a massive impact on my love for fantasy/sci-fi stories, specifically ones that combine elements of both genres like Bionicle does.