Well, this ending was a bit ass. Very mixed opinions.

The ending was the best part for me. It made me laugh a lot.

Another is only good if you view it as a comedy.

It's one of the prime examples for why horror anime, more often than not, doesn't work. To put it bluntly, the tone and direction are a joke. Everything is played completely straight despite its silly presentation and execution. Instead of building actual suspense and tension or play of ambiguity, the "horror" essentially boils down to superficial shock factor. The writing is also not particularly intelligent. In fact, one could say the writing quality is the scariest thing about the show. All these shortcomings cumulate and produce an immature feel. These are very common issues in the genre, especially among the mainstream. It's no coincidence that this director's worst works are all horror titles.

I think what invokes fear and suspense in visual media is not what they say but how they say it. Unfortunately, not much thought is given to either in standard go-to horror anime. The very fact that it's animated is arguably a significant drawback because it suspends reality, thus creates an inherent barrier for immersion before any flaws are even examined. That's why I always say horror is one of the weakest genres in anime.

On a side note, I view the many hyperviolent, oversexualized OVAs/films from the '80s and '90s in a more lenient light because they wear their silliness and overindulgence right on their sleeves. Most of them are still bad, but it's better than thinking they're more than what they actually are. Self-awareness is a quality lacking in modern horror.

I can agree with you on the ending. I think Another was a really good anime, but the end disappointed me. I liked the suspense of knowing someone was to die that month, and seeing it happen after something unexpected (the one in Episode 3 was the best IMO) was really cool. For the first 10 episodes, it had a 9/10 for me (not perfect but really frickin good).
Then arrived episodes 11 and 12 when everyone starting dying for no apparent reason, and it was a turn-off for me. As much as the anime was awesome so far, the ending ruined it a bit for me. I like that Reiko was the ghost at the end, and the way the main character reluctantly put an end to her. But that was the only good thing about the last 2 episodes.

Also, another thing now that you are done with Another, you should watch Shiki and find out who the better horror writer is in that couple ( Spoiler- the wife is much better than the husband!)
You won’t regret it!