I think the overall helpfulness of therapy waxes and wanes depending on how solid your present state of mind is. Mental health is a devious, fluid thing that drops straight into hell very quickly with little warning, but perhaps others are different. Before the headless chickens 'upstairs' decided group therapy would be the only thing I attended henceforth last year, I found my fortnightly one-to-one sessions very beneficial. I could get a lot of nasty stuff out and my psychologist was so plainly better suited to dealing with one person at a time. The group she managed was in fact weekly, meaning I had more quantity, but sadly not quality.
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On hiatus thanks to someone in real life breaching my privacy here, without my permission! May be back one day. +tips hat+