It isn't MO1 combat with a new attack direction. In MO1 you had a chance of tricking prediction and actually hitting a European player, without going to extreme lengths, who was paying attention. Maybe that was shit, and for sure not intended, but it was something.
I think thats more due to the easier blocking in MO2.
In MO I couldnt block someones hit to my sides, I can in MO2. That says to me that blocking arcs in MO2 are wider than MO.
In MO the one offensive trick you had was to hit the enemies back and the best way to do that was to trick people and play on the time it takes the enemies screen to catch up to your movement and so hit their back while they might look the same direction and in MO2 parry it but since at that time in MO he was looking the other direction and the hit went in.
This was less an issue before block arcs was widened in Awakening and blocking or parries got alot easier and Parrywhore Online started, before that you had to aim directly at the impact of the incoming hit to get a perfect block, slightly to the side and it was a blocked hit for alittle less than full dmg. Swing speed was insane fast so blocking normally not used except with shield, back then blocking was only one direction so you had to aim your block to receive the hit right center of your screen.
Which means 1 player could block 1 player infront of him for full dmg in group fights but if you had 5 on you 4 would hit for almost full dmg.
That meant a group of 5 very good fighters could eat through 20-30 average players because TTK was very fast 1v1 but 5v1 was a couple seconds. But since movement was also higher those 5 could outmaneuver instead of blocking hits so blocking was rarely used. Swing and stab arcs was also very small so average players rarely hit a fast moving good player. I kid you not the greatblade arc for SWINGS was dead center of screen, again like blocks slightly to the sides and miss, swing wind up was on the slower end but swing was super fast. Spears which became meta when mercy dagger spears got known since they had no wind up and hit super quick with low dmg.
But yes the whole prediction "abuse" was the reason that late MO had such ofensive capabilities, that and certain weapons like spammy maces/warhammers.