I like that we don't see a lot of defense in Goa'uld technology. They believe that the only threats to them will come through the gate network that they (until recently) control completely.
Their weapons are purpose built to oppress slaves.
Their chief forms of defense, when truly threatened, are retreat and burying a wormhole.
It makes Stargate one of the most plausible "humanity resists advanced aliens" plots - because the Goa'uld are caught on their heels, tactically by Earth's wormhole being activated by humans who shouldn't have found it and (the Goloa'uld thought) shouldn't have had the wits to activate it.