Questdog
Prince
If it's something to fear, you have to start every game the same way - developing your defenses. That is inherently less interesting, because it eliminates all choice.
Only if the rush was for certain to come. If you wanted to gamble that it wouldn't, then that would raise the tension level considerably, which to me equals more fun. And if you have total freedom on what to do, then that means you are not being challenged. The fun for me, at least in older Civs, was working my way up to the point when I COULD have some freedom to choose my destiny......