Were European knights even any good? (provide examples?)

[Joker86]

I guess if the longbow would be so ineffective to only slow down and kill horses and light troops, Henry V. wouln't have relied on them so massively that they represented 2/3 of his army. He could not have known there would be a wet, plowed acre and that the French would even allow him to displace once without charging while his formation was broken.

[Turboflex]

they even made archery practice a law, I guess cuz longbows sucked so much

[Casimir]

Its mostly because to pull a real longbow properly you need to be trained with it from an early age. The welsh, due to their pastoral and hunter based society, provided a lot of very good archers.  This however has nothing to do with whether European Knights were 'any good', the fact that weapons such as this came into popularity shows that heavy cavalry was a force to be reckoned with.