Its borderline criminal this series doesn't have a huge following. I do understand it used to be huge back way before I became a fan, its a shame no one gives this series a try whether reading the novels, the manga tie ins, watching the anime, or any other medium its in. It has a great story with fun characters, and does a lot with them and doesn't make a lot of mistakes other series do.
A lot of people just assume its a generic harem anime with a boring main character, you're entitled to your own opinion but you're still wrong because if you'd actually read the novels or gave any other spin-offs chance you'd realize how stupid you sound with inaccurate statements, I believe the series would be bigger without poser viewers and haters lying about the series.
The author/creator does like 6 different series with a new book practically weekly. His story-telling is pretty much "Main character is stupid and needs everything explained to him, and pulls the solution to the problem from his ass." Toma isn't much of a main character, he's pretty much a generic shonen protagonist. The series would be so many times better if they got rid of him and stuck with the Railgun of Tokiwadai (who has her own, wayyyyyyyyyy better show btw), Accelerator (a way more badass character with a lot of story potential), or Mr. Stiyl and/or Kanzaki (two characters who seem pretty badass but don't get much time to shine).
And Idk about the harem thing, I'll probably agree that it may skew towards a slightly more female heavy cast, but its not that out of the ordinary compared to most other anime. A Certain Scientific Railgun would be better categorized as a harem but it lacks a significant male MC.
Even with series which I thought were rather good years ago, watching them now is almost brutal. I'm beginning to think that a good test of my own tastes is to wait five years, watch it again, and then decide whether I really liked it in the first place. I have boxes full of "stuff" in storage from series I may not like anymore, but don't have time to re-read/watch to figure out how delusional I was at the time. However, there are series which I still re-watch from time to time because they are nothing short of masterpieces.
I love rewatching High School DxD, Akame Ga Kill, Date A Live, Girls und Panzer, and Hyperdimension Neptunia, guess I should categorize them as masterpieces... Haven't rewatched Baccano, and Accel World... honestly is only good from its second half. The first is very lack-luster. Haruyuki feels so much like Toma where they both feels kinda generic and what makes the show good is the side characters.
I imported A Silent Voice and IT IS A MASTERPIECE, I don't care who you are. Wolf Children is amazing, my favorite of the Hosoda movies (super hyped for Mirai Children though)