About time you actually watched the game. Bunney made several good tackles second half and he won a couple of good headers. Bit it of a luxury at times!
I agree he was better second half, but he did not win (or even put in) a single tackle in the first half and was beaten time and again with great ease. Against a better side that would have cost us severely. He does offer us something in attack, but should not start as a defender in my opinion until he has improved that aspect of his game. Buchannan is not the player he was a couple of years ago, but is still a long way ahead of Bunney defensively. As far as I know we don't have any other options at left back, as George Smith was sold.