The other posts do a great job of summing up the flaws in the KK2 line. I will only add this.
The 2006 wave of KK2 was actually pretty good. Kentis, Adric, Drakus, and Karzon, mixed in some neutral colors on the armor to very nice effect. They also had some of the best shields ever released IMHO. However, even with the better designs there were not any good generic soldiers. (like Davee noted) A nice torso print to make armies of those factions would have been very welcome and also gives a reason to buy multiples of the sets. Battle at the pass made an attempt to make generic soldiers by slappin different color euro armor and helmets on a bunch of figures but it really didn't work. These positives were too little too late to save this line.