Thoughts from the BI Elite team:
Masterpiece. Potentially my favorite PBI report design I've ever seen. I need to dig in to see how you added the hover effect to open the letter! Both the front and back side of the letter are so creative. I'm also a big fan of the font choice.
As for the content of the report, there could be more insights presented to the user, but this report seems to be minimalist by design. It provides you with metrics around email list growth over time, campaign performance over time, and open rates vs click rates. As you hover over the combo chart across the bottom, a report-page tooltip pops up providing easy-to-understand feedback about the particular campaign compared to the user's average campaign. This is a very nice touch to allow the user to dig a bit deeper.
Overall, very well done, Tim! Kudos to you for the AMAZING design work on this report.