Where to begin....
-Lack of basic analytic functionalities: Unable to compare segments of social activity by custom tags. We are limited to pulling exports of our various GTMs/Campaigns/etc and then must manually separate them for side-by-side comparison. Many other competitors offer an intuitive analytics dashboard that allows for easy segmentation of data and comparison.
-Lack of cybersecurity: 2FA and SSO are both industry standards at this point - especially for vendors selling to Enterprise customers. We were unable to get any timetable on when these features would be added (Highly doubt SFDC lacks the resources to roll this out in real-time)
-It is clear that a social management/analytics offering was an afterthought for the larger SFDC picture. Support teams are not subject matter experts, responses are frequently re-routed and response times are long. These guys will make you wait for a response that simply disappoints and seems to dodge your question.
-Can't embed video into scheduled posts....seriously?
-Lack of an asset library
-Lack of many convenient and extremely practical features that other vendors offer (vendors that have Social written into their DNA, Sprout, Sprinklr) Review collected by and hosted on G2.com.