First of all I like the concept of castle risk, and enjoy playing the game. I have done so many times.
The main concepts I like are:
end of turn troops (people will do risky battles to take color groups)
you alwase have a good size army (most of your troops come by castle)
no sitting around waiting for death
Theirs alot more stratagy with this game aswell. You might not attack the weak guy even if it will make you alot stronger, because you can't finish him off and if you weaken him your opponet will kill him and get his castle. Your opponet is in the same boat, so weak guy has a free pass, unless someone fails to plan.
However their is one big problem. The cards. They are WAY to powerful, especially the admrial and Diplomat. And they have the useless reinforcement cards to clutter up your hand. If you get lucky and get a diplomat card every round your practically guarenteed the victroy unless everyone teams up against you and stays so for several rounds.