The trouble is that the fatigued eyes of the non-perfectly visioned people are worse than the fatigued eyes of an able-visioned person.
Unfortunately your astigmatism is substantially above the Class 2 limit (3 dioptres) too
http://www.caa.co.uk/docs/49/SRG_MED...isual_Stds.pdf
Disappointments do happen, and I do sympathise with you, but I have to say that criticising the medical standards without presenting solid arguments won't get you anywhere. Put your energy into something constructive like gaining an NPPL which I believe you would be able to if you are medically fit enough to drive a car. (But don't quote me on this, I'm not in the UK and don't know much about it.)