I agree, although in my experience the Wetherspoons volume varies over the full range.
I have a local Wetherspoons and go occasionally. If it's quiet I'll stay. But sometimes it's unbearably loud just because it's packed with raucous people in a large, acoustically non-absorbent room, to the point that I hear "crackling" in my ears.
It's still much better than the pub next to it, which serves food I like, but is painfully loud all the time inside - even when it's completely empty. That's not acoustics. They play music at a hideous volume, and won't turn it down even when the place is empty - "company policy". I listen to music on headphones much of the day, sometimes quite loud. So it's not like I dislike music. Being the only two customers in a huge pub and unable to hear each other talk seems ridiculous to me.
We used to go regularly, for the food. Don't go any more - because of the music volume.
Another publike food place locally was really nice when we first went, shortly after it opened. It's become louder and louder each time we've visited - and now sadly that place is vetoed because of the volume too.
Again, it's because they play music ridiculously loud. It's lost the charm which I think was its selling point when they opened, and we won't go back.
Well, we joked we might go back wearing industrial ear defenders to make a point :)
At a fourth pub I went to an informal business meeting recently. It was afternoon, and not many customers yet. We had to ask them to turn down the music repeatedly just to hear each other.
Seems to be a theme. I'm not sure why they do it, because I doubt their staff or the other customers enjoy it much either.