Does 3200mAh sound underwhelming? Compared to 3500 and 4000, kinda.
But, remember that it's still an improvement over the V10, and combined with more efficient software and hardware, there should be an improvement in battery life overall.
Bonus is that it charges fast and is also removable. The design of the removable battery means that vendors like ZeroLemon are able to make much bigger batteries in modded rear housings.
We've been through this with the Note7, and I've said the same. Don't believe all the big battery rumors. Keep your expectations fairly low.