So just did a test, WAR tank vs PLD tank on Great Buffalo. WAR is easily still better as tank, even on a single-target physical monster.

PLD: Partial block on Onrush, 1934 points of damage.

WAR: Partial parry on same Onrush, 62 points of damage.

I was the PLD, my friend was the WAR. I was red, not blinking red, basically the whole time. Right behind him but could never overtake his enmity generation. Part of the issue is the immense amount of damage WAR does in comparison, which equals so much more hate it's ridiculous. Add to that the 1k additional HP, Rampage +Crits and Antagonize/Sentinel + Vengeance you've just got way more tanking potential.