I don't have a big problem if it is loud, if I don't hear any clipping I'm satisfied. It annoys me more if it's loud all the way through songs, even if I listen in my car that is a lot less than ideal listening place.
I'm a big fan of the Inception soundtrack so I'm going to use it as an example. The macrodynamics in it is enormous.
Let's compare Inception's Time to Vicousheads song in his signature for example, there is a clean part in his song so it's possible to do a rough comparison.
The great thing about soundcloud is that you can see the soundwave, excellent for educational purpose.
theviciousheadsociety - Abject Onion
[SOUNDCLOUD]http://soundcloud.com/theviciousheadsociety/abject-onion#new-timed-comment-at-85890
[/SOUNDCLOUD]There's a transition between clean and heavy around 2:00 min. Yet it's hardly felt or seen, I'd argue it feels less metal there than on the clean part. Strange isn't it?
I wont bother analyze a mp3 so no numbers here.
Vicioushead might argue it is unfinished but it's a typical example of many of the sound clips I listen to in the Rate my mix-section and some professional releases as well so it it's nothing uncommon.
Inception - Time
Here it's obvious that shit gets louder and louder AND LOUDER. I always find the part just before 3:00 min LOUD than heads explodes on the final repeat after 3:00.
I did a quick look on some key parts of Time:
First part, 0:00 - 0:30, the dBfs meter floats around -24 dBfs.
The middle part gets louder and louder until it reaches the final part at 3:00, here the dBfs meter floats around -3 dBfs.
The whole song has a RMS of about -15 dBfs.
(Method: Reaper -> Time.flac-> Voxengo SPAN, freq. analyzer)
That is a difference of 21 dbFs. Pretty crazy numbers, at least if you come from the rock scene, and that is a big reason why the song is so damn epic. The albums loudest parts are around -9 RMS so it's still close to other modern productions too.