My own issues with them were the time taken to mark the atpl exams. To add to this the CAA then decided that the time needed to book an exam in advance was to be increased to (I think) 15 working days meaning that booking an exam for the following month was simply impossible. No reason was given for this and as usual we just accept it.
I think my issue here is that pilots love to rant and complain about the CAA but nothing is ever done to query the authority's actions.
I know were are all happy once the exams are completed and behind us but we should at last question the CAA motives instead directly instead of just accepting them and being bent over the table every time.