First, series isn’t over, the author’s Facebook says he’ll start working on the 4th book, likely next year, after finishing the book on his other series.
Second, this is a good series. As a LitRpg series, it uses those elements well. The mc, who is no where near overpowered compared to the other players (200+), still manages through planning, tricks, and a good dose of lucky bastard, somehow to pull through. Without spoilers this book ends in such a way that wraps up a major plotline, in such a way that is consistent with the all the characters, and that makes sense given the story. While over the top, I enjoyed it. If the series ended, I would still be satisfied, but feel there is easily another two books out there in the world the author created. Luckily there is more. Would recommend the series if looking for a Litrpg series.