In the comment section of this answer, it was suggested that the answer was downvoted because the answer came directly from a wiki page. With that in mind, is it generally acceptable to answer questions which already have detailed wiki pages covering the topic by copying that content over and formatting it as an answer?
Yes, so long as you respect the wiki's content license.
For example, it appears to me that the answer "comes" from a previous incarnation of this article from gamepedia.com, which (unlike most wikis) is licensed with CC BY-NC-SA 3.0. This license is incompatible with Arqade's (theirs is sharealike non-commercial; ours allows commercial reuse). Even if it was compatible, it fails to attribute the original post.