The 1:1 merge option is great if you have one off duplicate lead issues. However, when you have uncovered a massive duplicate issue the only option today for a Marketer is to pay for a one-time service or get help from either an internal or external development team to run an API script. These slows us down, and can have major impact on running automation campaigns with the wrong data appending to the wrong record and triggering campaigns out to people.
I would really like it if Marketo had a Bulk Merge Tool that had custom rules similar to a smart list/Campaign, and could be ran on a regular cadence to prevent database duplicate bloat.
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