I don't like brand bashing as I like all types of bikes, however it is a fine line between talking about dislikes of another brand and bashing.
I read that 80% of Indian buyers were former HD riders. (I hope to be one or these soon as well) I think that gives them a little more leeway to talk about the dislikes of HD's since they were actual owners vs the guys who bash HD's but have never even owned one, or base it off of the HD they owned back in the 70's.
I think that many of them have been fed up with what HD has turned into for years, but have been looking for something that would fit there needs.
That being said, I have never been on the FB page to read what they are saying.
I have been to this site a couple times to check out Indian inf http://www.indianmotorcycles.net/categories/indian-motorcycle-forum.4/