I've done the BA F to and back from JNB a few times and I agree it is dreadful.
The crew seem to have NO IDEA about what they are doing. They are all very pleasant and nice but are either incredibly low IQ or just lack the training or supervision from the manager to ensure the service is delivered properly.
It can take 2-3 hours after take off to even get the starter. I often give up on the meal service and go to bed. It really is very poor for a F product and I Only fly CW on this route from now on.
My personal favourite is when you have to go into the galley to get your own cup of coffee in the morning as they have forgotten to actually bring it to you.
The food in F is also VERY poor.