Ok I'm here to write a short, concise review as someone who is experienced in all sorts of manga, manhwa, manhua, etc.

(There will be a TL;DR at the end of the review if you aren't bothered to read it.)

I went into Kubera with minimal expectations, as I would go into any other series. And, honestly, after the first season, I believed that the series had potential. Having been introduced to some of the best characters in the series (Kubera, Gandharva, Shess, etc.), the story was starting to take shape... until Currygom decided to give them close to 0 screentime during the whole of season 2 and focus on the characters that I couldn't give less shits about.

Plot-wise, there are so many plot holes in this story that it gave me trypophobia. There is no consistent narrative and there are so many main characters that the story keeps on going on tangents, and, even now (360 chapters into the series), I am unaware of what the plot is. There is no clear indication of where the series is going.

The art is ok for a webtoon. Seen better, but also seen worse. Nothing too epic tho.

Character-wise, some characters I genuinely liked, as I mentioned before. Too bad Currygom doesn't give them any screen time. Had any of the characters I mentioned before got more screen time, the series would have improved drastically. Also, some characters have no character development. One certain character repeated the same thing eight times and still has had minimal development.

Oh yeah, some characters just change their personality out of nowhere. One chapter they'll be crying and saying they're sorry and the next chapter they're beheading people and dabbing on the haters like nothing happened.

Enjoyment: it's ok. There was one point in season 2 when I genuinely felt like the story was going great: a lot of the good characters were getting screen time; the main characters were developing nicely and the story was moving along at a decent pace. Too bad Currygom decided to mess that up to.

Overall, I think Kubera is a series that had a lot of potential but squandered it. To be fair to the author, season 3 is looking like a major improvement. Currygom seems to have addressed the lack of screen time for the good characters, the lack of character development and the jumbled story. If this carries on, I see myself bumping up the series to a 7, nothing more however. Despite the improvements, I don't think the series is worth investing time into. There are way better series out there that you can read instead.

TL;DR: Good characters not getting enough screen time, little character development, jumbled plot without end goal, but season 3 is a major improvement. Overall, not worth investing time into.