This is only my opinion, but i believe that the major advantage of massed longbow was when used against a a cavalry charge or any charge in that case.If one had a weapon that could confuse a charge before the actual impact severely, it must have been a formidable weapon. If not killing men so much then atleast killing and wounding lot of horses. I would also like to see tests conducted with bows having the draw weights the ones in Mary Rose had. The question concerning armour penetration is very interesting as currently there seems to be a trend going on that discredits bows from their armour penetration abilities, not just longbow. It would be very interesting to see bit more high quality tests to be made.