Professional hitter who could flirt with 2 WAR as an everyday player next season. You aren't making a playoff push with him hitting #3, but a real solid hitter.
Going from Hosmer to Voit was a real good swing for the Nationals in that trade. Voit is a better player. He'll probably cost more in arbitration than Hosmer would have with Padres covering salary, but he is still cheap and is a guy who would be easy to flip next season if he is playing well and the team around him is headed to 100 losses.
I imagine he'll quickly become a fan favorite for lack of other options.