Top 3 favorite things about G1:
1) This is kind of silly/specific, but I feel like the team dynamics between the Toa teams in the books helped me a bit, socially. I remember learning sarcasm and there were other characters in TV shows/books that used it, and it was funny, so I tried taking that on a bit. But I remember reading about the Toa Metru, and when Onewa and Matau were sarcastic and kind of rude to Vakama all the time, I remember feeling bad for him. It was a really minor paradigm shift, but as kid-into-pre-teen, I think it helped me see the other perspective from a vantage point (somewhat removed reader) where I could process the interactions more. tl;dr - I liked the characters.
2) I also looked forward to new environments - jungle, city, rugged anarchy island, underwater, desert planet, etc. The created universe in the mythology was able to have all that variety in setting, and it didn't seem contrived or just shoehorned in for marketing, like "oh, all of the sudden we want to sell underwater sets so let's flood everything or something". A wide enough world where lots could happen, yet there was always room to discover new mysteries, if that makes sense.
3) While I do agree that toward the end of G1, the storytelling mediums became difficult to follow (serials, multiple strings of guide books, all corresponding with books, movies, sets, albums, not to mention a whole city's equivalent of a fanbase across multiple online hubs), I do think that the initial sets, books, and then movies initially provided a reasonable amount of consumer variety that would appeal to a much wider audience than either of those alone. My brothers, who loved the sets, could do their thing, and I could read the books to them and feed them source material to shape more play time with said sets. We absolutely loved that song "What it Takes to be a Hero" and would jam out to it like the nerds we were (probably still are). So, ways to interact/consume media in multiple formats, but nothing too crazy.