Caveat: I am a fan.
Short Answer: YES!!!
Longer answer: Seriously, it depends on what you are looking to "yoink" for other campaigns. If you need city ideas, plot ideas, location ideas, political ideas then the answer is YES! If you are looking for new rules, new spells, new prestige classes (it does have a few of those latter), then this is not the supplement for you. Get Creature Collection, Relics & Rituals, Warrens of the Ratmen, or something like that. Just remember this is a campaign setting, so it has things in it that other campaign settings have... but it is superior, IMHO.