I work as part of small marketing team. We have a full-time designer, but there are times when she gets bogged down with projects and I sometimes do some small-scale design projects myself. Adobe Express is handy for these types of projects and has helped me get more done while our designer is otherwise unavailable.
Pros
Event invitations - there are lots of different templates to choose from that fit a wide variety of styles to get you going quickly.
Social media graphics - lots of stock images and styles for inspiration
Social media ads - I love that they come pre-sized based on the type of ad you want to create.
Cons
I think this is true of all generative AI, but some of it can be hit-or-miss
You can make stuff for social quickly, but if you are wanting to do more detailed designs or edits, you're better off working in Photoshop, Illustrator or InDesign.
The UX is a little different than other Adobe products and can take some getting used to.
Likelihood to Recommend
Express is a great product for anyone that is more of a design novice than a seasoned designer. The tools can help you do lots of complex things that used to take lots of work very quickly. For example the 'Remove Object' and 'Remove background' tools work very well amazingly fast. You don't need to painstakingly trace around objects or worry about accidentally including something you didn't want.