waht are you suggesting? make them stronger?
or you could have them operate in two modes, worker mode where they are weaker, and then battle mode where they can't work, but can defend. still they would have laughable strength.
crazy idea: what about if they can combine forces, so for every other mud golem on the square they get +10% strength. so when under siege and you have 10 mud golems in a city, then the first one will have +100% strength, naturally after it dies the second one will have +90% strength, so can make a difference if fighting in large groups, but at the start with only 2 golems it doesn't help much for defence. i doubt it'd be too exploitable as you'd need 40 golems to het a strength 8 unit. which would take a long time and a LOT of hammers and upkeep. but at leastit gives you something to do with your huge pile of workers after you've finished upgrading every inch of your land(workers become pointless in the game after you've upgraded all your land).