Straight into it-
Combat
Combat in this is very unique and flows very well, however if people are having high ping it is virtually im possible for them to block attacks coming in from other players.
I have experienced this first hand and hope to see ping issues fixed (or at least what can be fixed). Other than that I love the combat, This may only be me but I find that the samurai have some what of an advantage in the combat however. I feel they are quicker and have longer range, in my experience I play as the vikings but when I go up against a samurai I get utterly destroyed. This may be because I suck however.
I have also experienced that a 2v1 situation is terrible for both sides, for the person getting ganged up on there is no hope, they can block maybe one or two attacks and get lucky, but they will get killed. As for the other 2 they end up hitting each other and dealing more damage to each other than the one hero on his own. Even after the hero is dead.

Maps
I understand this is alpha but for what it is worth the maps could do with some work, I love the start of the maps with the little scenes of units getting peppered with arrows and the charge and how basic units fight it out at the B point, but I feel the maps should have points mixed up a bit with units going to each as sneak attacks or whatever, and maybe have the battering RAM actually break down the gate to allow troops to charge in to assist the heroes on the other side of the wall. Maybe the attacks could have more troops and the defense team have better defenses.

Social
You guys defiantly need to make 1v1s with friends a thing, does this need an explanation? It most certainly speaks for itself.
The queues for getting into games is rather long and when you do find a game I find myself waiting for quite sometime to get into it, more often then not I get stuck with 3 AI on my team and 4AI on the opposing, or just AI on my team and 4 real players. This may be a Alpha bug but if it is not, get on top of it!

Graphics
Again, this may be a alpha thing, please add graphic options.
The textures are great and I feel very immersed.
It would be nice to have graphic sliders and other various options for the game though, and maybe a gore setting. (More blood/ blood splatter maybe on the brutal executions).

That's everything for now, fantastic game.
Keep it up.