Code Name S.T.E.A.M.
So far, it's actually a pretty hefty disappointment, due to a single primary design choice: The restriction to just the character viewpoints.
It's a core part of the game. It leads to a permanent Fog of War state, which is pretty awesome. But it means that any time you go to any map, there's a huge amount of trial and error with orienting yourself and having any clue even where to go. Combine this with the number of Overwatch enemies who will punish you for exploration, and the fact that every level introduces new enemies that take even more trial and error to figure out how they work, and it makes each new level a stumbling block.
Replaying levels is great, and the story part of the campaign is good. But learning new levels is so frustrating that I just found myself starting up a fight and quitting almost immediately because I didn't want to take the time and effort. So I can't say that I recommend the game.