I love bitshares, and think it is amazing. But when I first found out about it, was before I knew much about blockchain tech and I thought it was shit.

it was build for geeks by geeks without thinking of the average person way of thinking.

I think as more people get into cryptocurrency/blockchain and get more tech savvy, more people will see what Bitshares DEX is, and its value.
I use open ledger on bitshares. At one point I tried to create a bitshares DEX account not realising that I already had one (my open ledger account). The ecosystem of bitshares is confusing. A nice infograph guide would be handy, as well a nice video like you suggest explaining what Bitshares DEX is etc, where it came from and WHY. Why was it made? What does it achieve? People won't understand its value unless they are told, or research it themselves.

I've seen some great marketing techniques already implemented for getting people on Steemit/busy onto Bitshares DEX, and I think that is a good strategy for sustained growth.

Good luck with your marketing!