Overwatch's Latin America dub was made in Mexico by Pink Noise, a dubbing company that has worked with Blizzard, Sony and Microsoft for several dubs, and also they have a lot if not most of the best voice actors in and Latin America.
You can find interviews with the voice actors in the Overwatch LatAm Youtube channel, and I can say that their work is top notch. The only one I don't like is Junkrat, despite fitting the character well, is almost the exact same voice as Marty from Madagascar, and gives the impression that the voice actor doesn't have a big range of voices, but that's not a problem in game and is more an "issue" I find because I like Voice Acting and Dubbing a lot.
Also, here in Latin America we used to get the Castilian Spanish dub of games. I don't really know about other countries' take on this, but here in Mexico, we have a certain cultural disdain of Castilian Spanish dubs in cartoons, movies and videogames, so when they started bringing Latin American dubs into games, it was surprising to see such high quality dubs in games, especially from first party games (I know Overwatch is not a 1st party game, by the way)..