there is a guy posting videos on YouTube multi boxing 5 bm hunters on retail, he's hit most of the low level dungeons with this set up. I'm totally out of the loop on retail so I can give you any advice but I think they YouTuber is called Bro, might be worth checking out his videos.

I'm finding that even with wrath pretty much anything is viable low level because of the skew on the mechanics compared to the skills and talents available.