Out of the 3, one rightfully caused a lot of outrage and really still isn't a great game, one is probably p. damn good but I have never played it, and Overwatch looks good as well but I personally find it appeal to be non-existent.
edit: unless you meant hearthstone where I meant D3, and hearthstone grows boring/annoying really quickly as well. Lovely presentation though.
Entirely a matter of taste. I for one still argue that SC2 pales in comparison to Supcom:FA as a multiplayer RTS and that all Blizzard games of the past years are clearly inferior to to their predecessors (SC2 is equal, but has the godawful storytelling compared to the first)