Okay so marking english papers in this way is okay if your assessing spelling, puntuation and grammar but when your assessing comprehension, it shouldn't be as focused on. For the pupils in a class who are dyslexic, this sort of marking is really damaging. They may actually be very intelligent, just might not be able to communicate this is the right way. In this day and age it's easier to communicate in other ways, using media or just simply talking out loud.
This comes from two and a half years of studying education and almost being qualified as a teacher. It's quite interesting looking into how people learn and some of the best ways of assessing and teaching. You guys should look into it before making judgements. Nice to see people that value the English language though.