I soloed Baradin Hold today because i was bored and nostalgia. And I remember doing it with the guild i was in at that time. (they were terrible)
Early on in the expansion you did it with your guild, and it was a small thing to progress on and helped people get a taste for raiding.
It wasn't terrible hard, i believe you need 11k dps on average for the first boss (which my guild did not have) and you had some small mechanics. But it was fun and more social i would say than with world bosses now.
I think it would be fun to bring this back. or maybe a combination of world bosses and a baradin hold/voa like experience