They are definitely not a disappointment.
There were definitely adds and the adds had interrupts for once again. So many in fact that the tanks either could help the raid by alternating interrupts on different adds, or by ranged physicals helping out with every other interrupt.
Regardless of some of the comments here, many of the bosses had new mechanics. However, said mechanics were pretty intuitive and something you could figure out based on the indicators or the cast names or prior experience doing, really, any content blind. But intuitive is just how SE designs fights now so that's not unexpected or anything.
Spoiler:
The last boss using the mechanics from every boss was great and considering many of the people in the alliance died to them, I would say that no, a toddler wouldn't solve them. But them being from the prior fights meant you had an idea of what to do, it was just they were all packed together in the same fight so that you really had to know all of them or one of them gets you. I thought it was a great way to conclude the raid.