Westernization or the so-called “modernization” is very popular nowadays, and can be clearly noticed around the whole globe. It is difficult for me to talk about any Arabic shows specifically, because to be frank, I have never watched them.
However, I think that the American standards do influence the society to some extent and also influence the media producers in this region to change their shows/movies in one way or the other, and to make them seem more “modern”.
I can relate this to Hindi movies – if you watch Hindi flicks from about 10 years ago, and now, you will spot a very very clear difference in the way the actors are dressed, in the way they behave (Hindi movie directors have decided to break certain boundaries and incorporate “kissing scenes” into the plot, something that was thought of as very negative earlier on). However this draws their audiences very successfully.

Is it really positive to “westernize” media?
I’d say, that as long as the original culture is prominent throughout (and it definitely is this way in Hindi movies) it won’t really do any damage.
I think that what is common in many sitcoms/soap operas around the globe is the theme, no matter how it is portrayed the protruding theme usually revolves around love. Therefore the subject matter is more or less the same, just that American shows tend to be more “explicit” (i.e. language use, intimate scenes, etc.).

I don’t think that American shows/movies are very harmful to our society. Yes, they might present different values to those of our own, but in the end – if you don’t like it, don’t watch it! And if you think that they will “corrupt” the innocent minds of your children, then watch over them more closely and monitor what shows they can view.