Are the AoE 3 expansions worth it?

I really liked AoE 3 and was wondering if the expansions were really worth it? I was wonder what new things do they offer and the new natios?

the 1st expansions adds 2 native american tribes to the fray and the 2nd expansion adds the japanese, chinese and koreans (err i think). anyway the first expansion is definetely worth its weight (the warchiefs) the second however (asian dynasties) isnt that great .. more of an aquired taste sort of singleplayer experience but i guess if you love the first tol bits the expansion will seem worthwhile.

I really enjoyed AoE3 and got the warcheifs expansion, and I must say is it fun. The new campagin, units and areas are all pretty cool. Depending ifyou play online or not it is still worth it.