Were the Colossi the standard version (Bronze), or were they upgraded to Silver and Gold?
As an avid Zeus player, I usually go with 5-8 Medusas when my enemy is building expensive units. That goes for Colossi, Champion War Elephants, Hekagigantes, you name it. If you back the Medusas up with enough troops, and are decent at micromanaging, you can effectively destroy 3000 gold (10 Colossi) in 30-40 seconds with only five Medusas.
If the enemy attacks with a huge army of powerful units, you just need to make sure you attack the enemy army before it reaches your base, giving you time to recharge your special godpower, which only takes about 20 seconds IIRC.
I usually don't play as the Atties, but I would imagine the Argus would work the same way. That, and the Lampades, if you attack the enemy super-unit army in their own base. Don't forget, chaos basically removes all upgrades from a unit if you can't build/upgrade that same unit yourself.
I almost always worship Hera when I am playing Zeus. Having a few Medusas around can be a life-saver in certain situations. I think when people consider the Mythic Age MUs, they always leave Hera out (true she is only accessible through one civ, but that isn't a good enough excuse). I find that worshipping Hera in the Mythic Age basically makes you invulnerable to mythic age super-units.
The worst feeling anyone can ever get in AoM is finding out they just wasted 3000 gold, plus 400 favor, not to mention an additional; 300 wood, 300 gold, and 40 favor, in under a minute. Honestly, most God Powers can not even do that much damage that quickly. The thing about Colossi and Chimeras, is that to build them on such a large scale, you need to surrender all your population points, devote your villagers to favor worship (if you aren't Zeus), and then hope that your opponent won't be expecting a super-army of Colossi.
It is sort of like a single-shot strategy, because if you lose all your Colossi or Chimeras, you basically just lost all your resources, and the game.
[This message has been edited by DarkBrotherHood (edited 09-24-2005 @ 06:48 PM).]