The dice give advantage to the defender just like in the original risk... if the dice is a tie the defender wins, thats why when you attack you lose more than when you defend.. so the dice is, in face, rigged in favour of the defender!
YOU WILL NOT GET 50/50 odds, you will get close to 30/70 odds when attacking..... so yeah the dice suck for attackers!
Maybe im wrong somewhere,
l33t0r