RigaMortus2 said:
"passive" abilities are all great and all, but I do not see how a melee/spellcaster is more powerful than a arcane/divine spellcaster.
Spellcaster/melee usually has more HP, and probably a better reflex save, the the Arcane Spellcaster/Divine Spellcaster. Moreover, the Spellcaster/melee usually has less MAD.
Take, for example, the Sorcerer/paladin. d10 HD, Charisma-spellcasting, Charisma to saves, Charisma-based healing.... and as he only gets one action/round anyway, he can zap, zap, zap.
Compare to the Cleric/Wizard. d8 HD, Int and Wis spellcasting, turning, a few bonus feats. Sure, he's got spells falling out the wazoo... but good luck getting them all off. Meanwhile, it lacks the passive defensive abilities that the Sorcerer/paladin is enjoying. No SR, no full BAB for those attack spells (until you get to the point where you can Quicken Divine Power), and so on.
Take, as another example, the Druid/monk. Class features up the wazoo, all good saves, Wisdom-based spellcasting, Wisdom to AC, fast movement. Only two stats that are particularly needed; Wisdom and Con. Oh, and if the D/m decides to enter melee, lots and lots of options (monk abilities have no particular reason to go away in an alternate from, such as caused by Wildshaping).
Compare to the Druid/Sorcerer. Lots of class features and a metric wazooload of spells.... but three stats to worry about (Wis, Cha, Con), lower speed, can't use armor (arcane spell failure, don't cha know), and so forth.