@Errikos: the problem of directors lowering their standards dramatically is only part of an entire industry doing the exact same thing, and for many different reasons – a lot of them very technical. Around ten years ago I saw an interview with Francis Ford Coppola who talked about the wonders which will come out of the democratization of video. He said something like, "In an industry which was traditionally very difficult to get into, you may suddenly discover that your next door 12-year old neighbor is the next Mozart." You can now write, shoot, edit, grade and do sound with very little money. A great many more people have access to the tools needed to create audiovisual media. Whether this democratization is good or bad is a very complex question. Moreover, because of the dramatically lower costs, production companies' budgets get tighter and tighter: you're expected to do more with less all the time.
I don't think this is a directors/producers issue. The short span of attention and the ever-plunging quality of films (and film music) is a symptom of the fundamental spiral of addiction our society has for the new, the fast and the furious. I'm not sure how many 20-year-old people today could tolerate Andrei Tarkovski's "Nostalghia" with its 7-minute shots which I love very much (which doesn't mean I can't enjoy "Goodfellas"...) It's also very difficult for grown people to understand how people in their 20s can tolerate the stuff they're listening to. This is not a new phenomenon.
I, too, can't stand those Superman or Spiderman or whatever trailers which always have the same Stormdrum 8-bar pattern compressed into -0.3db oblivion. I, too, prefer what Bernard Herrman could do with a string section and a couple of clarinets. But like all periods of decadence, this one will pass, too... And those who are dissatisfied with the music they hear should do their best to write music they like. All this isn't Hans Zimmer's fault :)
Just my 2c.