Actually, maybe having an opinion about the shutter sound isn't so silly. I see that on my hard drive I have about 5,000 "keepers" so far this year (2013) from the several cameras I use. I put keepers in quotes because I use that word loosely; let's just say I have 5,000 photos that I have decided to "keep". My guess is that I actually pushed a shutter on one camera or another about 20,000 times last year. If I am going to listen to a shutter some 20,000 times a year, shouldn't I prefer that it sounds good?
I don't recall the shutter sounds on the Olympus E series cameras I have owned (E-520 and E-620). I presume they were neither pleasing nor annoying. But I do remember the shutter sound (ker-chunk) on the two Panasonic mFT cameras I have owned (G2 and GH2). The sound they made (your mileage may vary) sounded, well, cheap.
Enter the E-M5. I really like the sound of its shutter. It sounds very crisp and precise, like it was made by some Swiss watch maker.
Enter the E-M1. I really really really like the sound of this shutter. It has a slightly higher tone than the E-M5 and a shorter stroke. It seems quieter.
This video clip was taken with a NEX-6. I relied on the in-camera stereo mics.