Question: I bought my base model 15" MacBook Pro w/ Touch Bar the day it was released, and I just received it yesterday. I've been copying and downloading all the data and files that I needed and the battery didn't last me more than 5 hours, if even 4. I have no idea what is wrong with it, but it's really overheating and I almost never hear the fan running, which also alerts me.

Today I played Crossfire, a game with very basic graphics, on Windows 10 Bootcamp and it was ON FIRE! I had to close the game because of the laptop's temperature. Again, I did not hear the fan.

Things I've done:

* Reset the System Management Controller (SMC)
* Run hardware diagnostics by restarting and pressing the `D` key while booting. This was the first time I actually clearly heard the fan. The overall results were that it found no hardware problems.
* I called Apple, but they had no idea what they were telling me as they were following a written script, although a Senior Advisor was talking to me regarding the issue.

Now I have had it just for two days so far, and I have a two-week return period. Should I wait more and see how everything will work out, or should I return it?

Has anyone experienced the same issue? Is there anything else for me to try?

Answer: 
The problem you discribed is exactly the same that I have with my new MBP 15" Touchbar (2,9Ghz, Radeon 460). 
The reason why it's overheating is, that the fans do not automatically accelerate when there's a higher workload. They are continuously running at 2000 rpm. 

My solution: Use iStat Menus

There you can manually increase the rpm to medium (3500-4000rpm) and high (4500+).
You will see, if you manually adjust the fans, the MBP will work great and there won't be any overheating issues.

BUT that's not how a notebook should work. It must automatically adjust the fans.
I talked to several apple support guys (In Germany) and they all told me, that they havent experienced such a thing yet. I did the same things like you, resetting NVRAM, resetting SMC and I even reinstalled the OS. Nothing helped.

It may be a firmware issue that will be fixed in the future. However it seems like just a minority of MBP Touchbar customers are facing this issue.
Most likely I will exchange my notebook in January (since it's not available at the moment xD )
How did you reset the SMC? There are different processes depending on Mac model. Just to make sure, in your case the process is as follows:

1. Shut down your computer
2. Keep the power cable **plugged in**.
3. Press at the same time `shift``option``control` (on the left side of the keyboard) ***and*** the `power button`
4. Let go
5. Turn your computer back on with the power button.

Also, do you actually *know* what the temperature is? If so, please add this to your question as it's a bit hard for the community to help/comment without knowing what it is. You can use software such as [Monit](https://itunes.apple.com/us/app/monit/id1014850245?mt=12), [Fanny](http://fannywidget.com) (an unfortunate name!) or [iStat Menus](https://bjango.com/mac/istatmenus/) to measure temperature and fan speed.

Regardless, as a point of reference, this [resource](https://www.intelmactemp.com/list) (which can be filtered) will give you an idea of the wide range of temperatures that Macs can work with. It may be a bit too early to include any data for your model, but there is a lot of data for MacBook Pro models listed. As an aside, my MBP temp is regularly between 66 and 81 degrees, and my fans are regularly at 6200 RPM when my CPU usage is high.

All that said, if I was in your shoes and confident that it's overheating and the fans aren't activating as they should, then I'd be making a Genius Bar appointment to have them test it. If a Genius Bar appointment isn't possible, and you have the option of returning it, then maybe that's what you should do and buy another one.

Finally, in terms of your battery life, was the 4hr-5hr range just your initial range, or has it only lasted that long consistently? I ask because downloading and copying all the data you needed on your MBP is likely to be a much greater burden on your battery than normal everyday usage.

Feel free to post back if you get any more info or have any other questions.