Muscovies are NOT loud--they are almost silent. However, they do fly, and quite well. They also are a terrible choice for layers, because they invariably will set and hate to have their eggs stolen (though for these exact reasons they make fab self reliant meat birds especially on open range).
All ducks "need water"--they are after all waterfowl. Muscovies seem happy with less water time than mallards, but they still need full access to water containers large enough to bathe in, that will need to be kept clean. Depriving ducks of water access just seems cruel.
The "friendly" thing comes with time and them getting used to you, but I don't see that being much different.
One tip: don't expect ducks to be just like chickens. I too started with ducks after years of keeping chix and was surprised by the many ways in which they differ.
I too am bemused by the idea that "ducks are better than chickens." As someone who keeps both, I can tell you that chickens have many advantages ducks do not and vice versa, depending on the setting and circumstances. If ducks were universally better, why would so many people be keeping chickens?
Also, I'd recommend starting your own new thread for these kinds of questions. Tends to get more and better feedback than posting questions on other people's old dead threads in my experience...

good luck!