I'm not familiar with Android Central reviewers, but I generally only trust reviews written by journalists with engineering/cs backgrounds when it comes to these kind of topics. I should have clarified by running hot that it no longer seems uncomfortably hot to hold, but this is because it is throttling.
From anandtech:
"SoC performance is a mild improvement over Snapdragon 805, and a significant improvement in GPU over Snapdragon 801. However, it?s definitely alarming at how small the differences are when Snapdragon 810 is placed in a phone, and it seems that the thermal output of the Snapdragon 810 is high enough that sustained tests end up placing it somewhere around the range of the Snapdragon 805 in CPU-bound tests."
and
"This is really the first generation to my memory that actually regressed on battery life in our benchmarks, which is concerning for any device with a Snapdragon 810 SoC. It may be that this is just HTC?s problem, but given that HTC has generally managed to do well at extracting maximum battery efficiency from previous platforms I?m not sure if other OEMs will be able to improve the situation here."
There is a part two so maybe something could happen between now and then, but they were using a fresh firmware update for the first part of their review.