It's a slippery slope - even if they continue to consume part of illustrator artwork the report, they might miss things you really wanted them to see. Here are a few tips: Instead of starting the report by creating a list of metrics you (or your customer) want to see, start by identifying the questions you want the report to answer, then create the report to answer those questions.
If a client or stakeholder provides a long list of metrics they want to see, drill down into their reasoning and make sure these are the right metrics to achieve the report goals and ultimately the campaign success metrics. Remember that sometimes less is more. If a stat isn't useful, don't include it,
no matter how good the chart looks. Do not attempt to create a single report. Different deadlines tend to require different reports. Likewise, if there are multiple stakeholders with different interests, it may be beneficial to create separate reports, as opposed to a watered-down report. For example, if one report is for the marketing manager and the other is for the CMO,