Sure as heck am glad we don't have moles. Sounds like a major headache. Could think the only option would be container planting (pain that it is). Or the wire cage planting.
I'm always happy to see worms in any garden I'm trying to grow in. They indicate to me that the soil is viable. Worm farm units here are popular, to add their castings to a poor soil to improve it.
Back to the original question - I agree with the answer that if you have marginal soil, enrich it first (cow/chook poo, pea straw etc), let it sit for couple months, then add some worms. If they are already there - your soil is good. Worms are one of the greatest aids for your soil. They'll fertilise it, churn thru it, aerate it, make it much better to work with.
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