What is Reddit's opinion of Is It Wrong to Try to Pick Up Girls in a Dungeon?, Vol. 1 (light novel)?
From 3.5 billion Reddit comments

By popularity on Reddit, this product is:

#141 in Science Fiction Adventures books

#10 in Japanese Literature

#26 in Asian Myth & Legend books

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6 reviews of this product found across Reddit:

Volume 11 is coming out in June. You can also find all the above on other stores like Kobo, iBooks, etc.

google books

amazon

Danmachi(Is It Wrong To Pick Up Girls In A Dungeon?) Anime and LN
Monster Tamer (LN)
Hai To Grimgar aka Grimgar Of Fantasy and Ash (More realistic fantasy) By The Grace Of The Gods (super wholesome)
Don't F*ck With The Healer! (Recently read this one, it was actually decent)

There's many more, but those are the ones I've checked out lately.

Unofficial links aren't allowed to be posted as per the subreddit rules. Your best bet is to buy either the digital or physical books.

Amazon: https://www.amazon.com/Wrong-Girls-Dungeon-light-novel-ebook/dp/B00LZYBVJ4

Google: https://play.google.com/store/books/details/Fujino_Omori_Is_It_Wrong_to_Try_to_Pick_Up_Girls_i?id=c3kPBAAAQBAJ

Danmachi

No game no Life

Heh. Let me link my description of LitRPG from my group on Royal Road. http://forum.royalroadl.com/showthread.php?tid=88435

Some of the first LitRPG I got into was 'Girls in a Dungeon. https://www.amazon.com/Wrong-Pick-Girls-Dungeon-Vol-ebook/dp/B00LZYBVJ4/

This series is set in another world where gods and goddesses on the planet can invest some power in adventurers. This allows them to literally level up by accruing experience via fighting monsters. There is a leveled dungeon system that the MC delves to make his fortune.

It's a light novel series so it's not a literary masterpiece, but I thought it was fun.