How secure is it?
If it can be opened legally by a person with the authority to open the door, then it can be opened illegally by anyone able to hack the WiFi signal to the door lock, forge an authorization token for the room, and be inside looting all your stuff without ever triggering security.
At least with a physical room key they either have to steal the key, duplicate the key, or get their hands on a master key to gain entry.
With a Key Card entry system, they've got to obtain a card, a reader to program the card, & hope it works when they approach the door (else they'll slam headlong into the door when it refuses to open due to a wrong code, which also notifies Security).
Sure it's convenient, but how are they going to secure it against some schmuck using WireShark to sniff the transmitted packets, breaking the "encryption" of "password12345", and using that data to gain entry to every room in the place?