In general, using rand() is perfectly fine for basically everything unless you're running a gambling site, ultra high precision probabilistic algorithm, cryptographic infrastructure, or other highly specialized tasks. Nothing like information overload to put somebody off programming.
Using rand() is perfectly fine *if* you only need....
I completely agree that rand() is less-than perfect in many many situations. If the rand() implementation varies from compiler to compiler (which I think was the case was the C++98 standard, but I might be mistaken here), then that's yet another reason why you'll need your own implementation, so (for example) generated map seeds can be shared over the internet with users using your game compiled with different compilers on different operating systems.
My only point (directed at the OP's 'why such a simple response'), was that rand() works perfectly fine for a console game or a tetris/asteroids clone, and that anyone not understanding when and why to call srand() more than once, is also not needing anything better than rand(), and probably wouldn't understand how something like a Mersenne Twister implementation works.
Thankfully, C++11 has new better psuedo-random number generators (such as built-in standardized mersenne twister, among others), though because their usage is all templatey and classy, which is great for intermediate and advanced C++ users, a beginner will probably still use rand().
Discussion among more experienced developers (like in this thread) about the nitpicky implementation details is of immense value and very educational to people who didn't go through college (like myself). It just overwhelms people still trying to understand the difference between references and pointers, and possibly drives them away from programming because "it's too confusing".