Even on a good day, I would have a hard time attributing any value to many of the meme posts on there. From what I've seen, about 80~90% of the meme posts are blatant plagiarism. Ripping comics and jokes from other sites and reusing like crazy. I've called a couple people out and said that it's not that hard to come up with an original 8-word joke of their own, but most people aren't having it.
I haven't paid ANY attention to how the dmania account upvotes though, but I'm not overly surprised that it's doling out to it's own sock-puppet accounts.
Its pretty broken. I create my own memes - gives me something to do and think about with my morning coffee - its a bit sad though when I see what gets upvoted by the bot or makes it to trending. As you said its not that hard to make a 8 word joke!