Thomas Shey
Legend
It may be atypical, but my group struggled with...
1) Differing Target Numbers depending on the Parry value of enemies.
How's that any different than DC or AC numbers?
2) AP, Armor, Toughness, and conversion to Wounds.
I'm guessing they hadn't played with damage absorbtion armor systems at all before? (I'm not being snide, people who've freshly emerged from the D&D ecosystem often haven't).
3) Tracking Wound penalties.
I'm not sure why that'd be difficult, but if they did they did.
4) Spending Advances to "level up"
Again, is that harder than spending on Feats and the like?
5) Multiple action penalties
I can at least see people not used to that sort of thing having to get used to it.