Is it useful to know the percentage of your audience using Outlook on a mac? Probably not for most people, but it's definately important for the mac ops crafting your HTML. CME's reporting is split by role:
Is an open rate of 20% good? Probably not if it is to your best fans, but it's great if it is a last ditch effort to re-engage disinterested customers. Every number from CME is compared to the rate with CME's artiicial intelligence expects, the rate you got last time and any KPI you have set.
60% of all the people who clicked on your link are female? How does that compare to your database? To other links?
Most of our clients track at least two hundred attributes about every customer, with some clients approaching ten thousand attributes. CME presents back results if they are a) critical KPIs or b) significantly different. Everything else is put into the appendix.