My experience with the botnet golem from my solo game in SlimDX was terrible--it drained way more of the economy than in comparison in maintaining my main fleet, along with ten thousand mercenary fighters. Cursed golems the same (these were worse, and the game decided to throw in three seeds of these), and again, anything that requires constant repair wasn't worth it, and if I decided I wanted to just suicide my fleet in and take a few thousand casualties, I think that would have been better than using a golem.
My best experience was probably with widows--they didn't self-damage. :\