Their meagre bombardment will usually result in failures when used on cities. As such, they are only useful against units, probably during defense.
Cannons are similarly not cost-effective. Sometimes 10 of them will fail in bombarding a city. Not worth the trouble when you consider that you have to babysit the cannons while they crawl at 1 square per turn towards the target. And all the while you pay upkeep (20 cannons for 50 turns = 1000 gold for rushbuilding other stuff).
Cannons are similarly not cost-effective. Sometimes 10 of them will fail in bombarding a city. Not worth the trouble when you consider that you have to babysit the cannons while they crawl at 1 square per turn towards the target. And all the while you pay upkeep (20 cannons for 50 turns = 1000 gold for rushbuilding other stuff).
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