I've been watching the wait time for Smuggler's run on the Disneyland app. It's current wait time is 5 minutes. I've seen it around 25 minutes for most of the day. From what I've read, the biggest attraction is Oga's Cantina.
Doesn't look too bad. I would say that the reservation system they put in place is working as designed. The real interesting will be the day after the reservation period ends and it's open to the rest of the public.