I don't think there's a single person outside of Madison Avenue who thinks loud commercials are a good thing. In fact, I'd say that if there were an easy way to quiet them down, everyone would jump at it.
Well, a commercial muffler may have finally arrived in the form of SRS Labs' MyVolume adapter, a small $99 plug-and-play box that connects to any cable or satellite box via HDMI. Plug it in, and everything — TV shows and commercials — get leveled out to the same volume. I've been using the MyVolume for a couple of weeks and I can say it's the real deal.