Speakers are funny things, they can sound great in one room while totally falling apart in another, that's why it's so important to review them in there intended location if possible. Saying that, if the speaker balance is just too extreme you can get an idea that it probably isn't going to be right for you, no matter where you listen.
Years ago I decided to upgrade my audio system speakers and basically listened to a dozen or so over a two month period in my dealers demo room (it was easier than carting them back and forth to my home!), from that I narrowed it down to just three, which he kindly delivered so they could be connected to my system for a more extended listen in my room, after which I then made the final decision and payed the man. The surprise was the "best" in the demo room was not in my room, it was another which finally swayed me, I was confused, but guess what, he wasn't, apparently it happens all the time, the room and it's furnishings can be pivotal in the the final choice.
Now Apple's HomePod is a little different in that it has the ability (technically) to adjust to it's environment while others don't, so it should sound great (or as near as possible to great) no matter what, but with all these varied reports something isn't quite right. If I had to guess, I still believe Apple may have tuned the performance a little towards the "bass" mainly to appeal to a certain audience, but in doing so could of made it too extreme in unfavourable environments and therefore ends up beyond it's auto tuning ability to compensate.
Those with more favourable rooms simply don't see this as an issue because one offsets the other, a sort of "the some of it's parts is greater..." so to speak, looks to me as though you may have fallen in to this category.