Strange you noted the delay in dropping off the luggage at Port Canaveral. We sailed the Mariner 24-Sept and it was exactly the same way. They told us they had a "drug bust" on their return to port, and that delayed the debarkation. On the other hand, we sailed the Glory on 5-Aug, and had no delay at all dropping off luggage. Exactly the same port, exactly the same pier!
I felt pretty much the same about the Mariner as you did. Beautiful ship, great crew, excellent service, average shows, horribly crowded, way too many uncontrolled kids aboard, and not enough activities to keep all those people apart! I'd sail her again only if the price was "right".
See you aboard,