I have to agree that there are a lot of bands that play over loudly but round my way there are a couple of hotels that have sold part of their land. The developers come in, houses are built and then the hotel gets complaints from the neighbours for loud noise.
There are 2 pubs in my area where we were the last band to play the venues. The first was the first time they'd had a band- - Vocal PA, I think at the time I had my Trace V-type combo so 150w at my disposal if I needed it and a guitarist without an ego which is a nice change.
We were very quiet compared to bands in other venues in town but the pub still got complaints from the old dear upstairs.
The second was quite a big pub so I had the same combo and a Trace 2x10". By the second song we were being asked to turn down so i disconnected the extension cab, we played quieter, the drummer played with brushes but it still wasn't quiet enough.
The smoking ban has been great as far as I am concerned but it has increased volume levels outside late at night by a hell of a lot. Especially pubs in residential areas and that has been a factor in incresed complaints to pubs as well.
I do have experience of overkill as well though: boxing day last year I depped for a rock band. The pub was so small that we took up about a quarter of it between 2 guitars, drums and keyboards and a 3k rig! Absolutely no need for anything like that. I struggled to hear my monitor which was right next to me pointing right up at me for the sheer volume coming from the PA