The Diplomacy of Dominions 2 is all on the ability of the player and the inherent weaknesses of those you are playing with. If you play with alot of defensive, 'try to build up', nonaggressive, people you have two options, go with their Alliance/NAP then kill them later when they may/maynot be more of a threat/asset. Or kill them immediately and find the key superpowers of the game.

Often Diplomacy is a result of Battlefield prowess, too much staring at the Score Graphs, or simple human characteristics.

IMO exactly what it should be.