Honestly, C seems to be one of the easier languages to teach the basics of. It's certainly easier than Java or C++, which have many more concepts.

C has some concepts that confuse the hell out of beginners, and it will let you shoot yourself in the foot very thoroughly with them (much more than say, Java). But you don't tend to encounter them till later on.

I have never said getting good at C is easy. Just that it's easy to pick up.