I'd have to say...yes and no. (how's that for having firm convictions!)
I think it depends on who you're trying to reach, how ideologically committed they are, and how consistently you hew to the truth. My understanding is that during the soviet era, reports by VOA had a certain amount of credibility because they were honest and frank about things that did not reflect well on the US.
Of course ideologues will never accept anything which doesn't fit their definition of "truth" but I think it is worthwhile, and, over the long run, to stick to the truth as much as possible.
Yes.
The Israelis demand the truth, the Palestinians want to hear biased news, and the Americans only know about the first thing they hear. (that's gross oversimplification, but it's basically true)