Having played a hunter since Vanilla, you've no idea how good you've got it now.
I've had pets running the wrong way round Karazhan, being unable to jump down anywhere (always taking the long way and pulling anything as they go, this was fun in LBRS), being unable to attack because they're stuck, being unable to attack because the mob is too big, dying to AoE, pulling shit of their own accord...
A catalogue of fuck ups, that led to us being called huntards, and many groups insisting that we put pets away in dungeons. And it was mostly down to pet bugs.
They don't happen any more, and there's lots of classes that use pets. The pet is integral to the hunter feel. Without them, we're just rangers. Or Legolas. Which is worse, really.