Before an elbow injury in 2018, Andrus averaged just above 3 WAR a year for the Rangers. It would probably be frustrating during it, but there are worse outcomes.
You want a #1 pick to be more than that, but if he can do a job at SS to the point Nationals don't have to worry about the spot, then that's a solid pick. C+ Passing, not great.. Especially since he was an underslot pick in a weak draft.
In his favor, after a half decade of horrific team defense, a quality glove at short would make me very patient with his plate output.