I don't feel it's that flawed but that's my opinion.
I only play NA siege, so my opinions are probably skewed due to that server's problems:
-Attackers winning 80+% of the time because the maps are balanced for EU population #s
-Broken maps that stay in the rotation for 6+ months
-Map glitches (getting stuck, falling through ground, getting catapulted off ladders, etc)
-Admins are rarely on
Combined with the issues with the mod overall:
-Poor balance between skills/attributes (riding and shield basically are only useful to meet requirements, WM sucks, str passives much better than agi passive, etc)
-Item stat balance is haphazard, slow, over-reactionary, and not grounded in sound mathematics (i.e. balance stats until they "feel" right)
-Unrealistic and easily-abuseable game mechanics (hiltslash, lolstab, horsebump range, everything about how pikes work, kicks, and now nudge)
So yeah, this mod is both awesome and awesomely flawed. However, just like having a girlfriend that is both crazy and crazy hot, most guys would stick with her despite the crazy.