You have to remember the standard that it takes to get onto your course and the number of people who drop out along the way. Of course the majority get a 2:1, but I feel uni isn't so much of how well you do along the way, it's the fact you do do it and what you learn along the way, and a 2:1 tells you that you did it to a good standard.
Having a good extra curric puts you beyond the others though I would highly recommend concentrating doing this during your degree.