Let's put it like this... it's not *all* good, but it sure as hell beats the alternative. No freedom of speech means democracy is impossible. As is anarchy, since someone has to be the one in charge, making sure people don't say the wrong things. This leaves a bunch of different ways to run a country, but they all fall into the dictatorship category. Now that's not necessarily bad. I think it beats the crap out of democracy if (and it's a big "if") the rulers do everything the way I want it done. You know... if they kill all the people I don't like, and none that I actually do like. If they only arrest those who are truly guilty of something I think should be a crime (but of course they should let me go with a warning if I make some tiny little mistake -- only punish others!!!). If they let me go about my business, and only bother people I don't give a damn about. If they made all religions illegal, so that everyone in the country would share my beliefs... Yeah, that country would be great. Don't you agree? No, probably not... I'm pretty sure at least 95% of all people wouldn't. And that's the problem.
Without free speech (and thus democracy), we'd have to rely on the benevolence of our rulers, and that wouldn't be worth shit if we didn't share their opinions and values. Of course dictatorship is a good idea when it's on your terms. But in reality, it's always on the rulers' terms. In a utopian world with a single "good" and everything else being "evil", of course it would be great to live in a society with a good dictator that makes everything evil illegal. But in reality "Good is a point of view" ( --Palpatine, Ep. III... yeah, yeah, it's a prequel, but he's right, nonetheless). One man's freedom fighter is another man's terrorist. One man's hero is another man's villain. One man's religion is another man's superstition. One man's holy crusade is another man's slaughter of innocents. Need I go on?