I didn't think it was a good tackle in real time, but did think it looked fairly innocuous. Clumsy, late, but didn't think it was going to cause an injury, let alone one that kept a player out for a season.
Replays showed it was a very dangerous tackling style, and if he and Dyche both saw nothing majorly wrong with it then that says all you need to know about their lack of concern for the welfare of any other teams players. Hate them both.
Don't get me wrong, love a Guilbert style slide tackle, but you shouldn't be doing them at any angle beyond perpendicular to the forward, and you shouldn't be wrapping your legs around a player in doing so.