I've played the campaign with Necrons, Eldar, Chaos and Tau.
In all of above cases I noticed that the stats in the Commander's screen (where you buy the items) is not the same as the stats of your Commander when you're in the battle (not world map).
For example, I maxed out my Chaos Commander to get a Daemon Prince. HtH damage was shown as 1100 on the Commander screen. However, once in a battle, the HtH damage shows up as somewhere around 400+ (cannot remember exactly, but it's between 400 & 500). The HP however is correctly displayed.
Same error appears in the ranged values.
Other problem I have is with the attack-move command. When I attack-move any unit, it moves towards the destination, attacking along the way. However it's not working as expected. I'll try to paint a picture.
My daemon prince is executing an attack-move command. Along the way he spots a squad of Space marines and move in to eviscerate them. After finishing off the last one, instead of continuing on his merry way, he turns around, moves back to the spot where he first spotted the enemy before continuing on the way.
Quite irritating. Why not continue the attack-move command from the spot where he eviscerated those marines? This happens to 90% units I've tested. It creates a zig-zagging line of units getting in the way of one other. Only way to circumvent this is to issue anoter attack-move command as soon as your soldiers pound upon the enemy.
Anyways, this is it for now. Despite the bugs, I still love this expansion to bits!
PS - not sure, but I noticed the Daemon prince loses some of the bonuses that the items gives the Chaos Commader before his transformation. One is the ability to detect stealthed units. It this a bug or not?