How are you handling multi-source attribution/influence?

It's that time of year where our marketing leader gets inundated with requests for attribution reports. We have several fields that we use for that purpose, but each one reports slightly differently.

I'm about to use the L word, but here it goes:

We're currently using various fields: original lead source, latest lead source, primary campaign source - but single touch attribution is hopelessly inaccurate.

Qualified has this great little self-managed package for Salesforce that shows influenced pipeline, influenced revenue, etc.

There are also solutions like Full Circle.

So at the end of the day when people come poking around for attribution numbers, what's your solution?