Board Thread:General Discussion/@comment-24484256-20150411130712/@comment-25047329-20150411164227

There are many people who are disappointed in the changes because a lot of favorite scenes didn't make it in. Changes aside, it just plain wasn't well written. Things aren't properly explained, character motivations make no sense half the time, Kaneki is an empty husk of a character in RA, plot points go nowhere, important characters are mentioned or introduced once then never seen again, etc.

I saw the anime before reading the manga and still knew it was bad. I don't know much about Studio Pierrot as a whole but since they're the ones responsible for the anime many disgruntled fans want the property separated.

Root A strictly refers to season two of the anime btw. It's called that because it takes am entirely different root from the second half of the manga.