I took QBASIC my junior year of high school. You learn that QBASIC, Visual Basic, C++, Java, and all programing code is very similar, one concept you learn in one type of code, is very similar in another type of code. For QBASIC, I even made a really crappy version of Pac Man, so it all depends on what you want to do with your code.
QBASIC was one of the first programming languages to make games or applications on computers. Code entered into the IDE is compiled to an intermediate form, and this intermediate form is immediately interpreted on demand within the IDE. I took QBASIC as a junior in high school and although it was old and you can't really do much with it, it was still fun to learn.
You can make a bunch of different things with QBASIC. Whether it is an old version of blackjack or just music, it is still interesting to do. Here are a few examples of what you can do with QBASIC: