Jagged Alliance 3 is rated 'Strong' after being reviewed by 11 critics, with an overall average score of 82. It's ranked in the top 11% of games and recommended by 90% of critics.
The coop is kind of brilliant. You share resources, but each control your own merc team. Only the player who activated a conversation can control it, but the other player sees it happening and can suggest dialogue choices.
You can also continue coop saves on your own, and so can your coop partner, even if they weren't the host. It's really well done.