I started school in August 1992. I still remember being sat on the classroom floor while the teacher taught us what a noun was, what an adjective was etc. We were worked hard and we learnt a lot, but nowadays, there are students graduating with 2.1 Honours and going into teaching and professional academia despite being basically incapable of correctly stringing a sentence together.
Unfortunately, academic standards these days are so low across the board that you can hand in half finished, factually incorrect, barely literate garbage and still get 50%+ even at many good universities. Obviously, those with genuine learning difficulties should be cut a whole lot of slack but there should be no mercy unless their learning difficulties are proved and verified. Marking schemes like that are a joke that makes a mockery of those who genuinely want to work hard and do well, as the slackers can cruise to vaguely acceptable marks by doing not too much above bugger all - not only that, but these people are often perfectly happy with disastrous grades despite being capable of much, much more. Working hard and excelling is devalued and discouraged, as the slackers get it all on a plate and those who do work hard and put the effort in end up thinking "Why do I bother if they can do nothing and still pass?" Our entire academic system is broken and the rot is spreading fast.
Group work can be frustrating indeed, for this reason. You always get one lazy asshat who does nothing and prides themselves on awful grades and laziness, but take it as a consolation that such behaviour would earn him or her a P45 in the business world.