I must point out, in the interests of fairness to Mel Gibson, that this element of the plot was inserted at the insistence of the studio. He didn't want it.
But yes - plenty of other nonsense here. What's more it arguably did long term damage to the British Union as it's a great piece of ill-informed SNP propaganda. But thank God, the SNP have been soundly thrashed at the last UK election.
Despite the realism of the battle scenes, Braveheart is pure myth making. I enjoy it as myth, the same way I enjoy The Adventures of Robin Hood, with Errol Flynn.