I'm fairly sure Silk Road never offered multisig transactions.

Here's a (fairly old) blog post describing how escrow works in OpenBazaar:

https://blog.openbazaar.org/how-moderators-and-dispute-resol...

You can choose an escrow agent at checkout time, or alternatively pay the merchant directly and take your chances.

I bought something off OpenBazaar just to try it out, I paid the merchant directly and the item arrived promptly. It was a positive experience and I'd use it more if there was more stuff available that I wanted to buy.