Carley - I took the email deliverability specialization, and passed easily. I found it to be more focused on terminology and IT rather than scenario based. Some of the wording on a few questions was weird and unclear. I think the 'Marketo Certified Consultant' is a thing of the past. I believe you can now be an MCE, have Marketo Specialist Certifications, or take on the Marketo Certified Solutions Architect process.