A good tactical strategy game. The only problem I have is with the stress mechanic that cannot be turned off in the custom difficulty settings. The one thing I absolutely cannot stand in these kinds of games is soldiers disobeying orders and getting themselves killed because they didn't execute my plan, It really annoys me. I get that this is one of the themes of the game, as it's a bit of a Spec Ops The Line in strategy form. But you let me tweak difficulty to my liking in other areas, why not this?
The gameplay is a solid compromise between real-time and turn-based. A the start of each turn you get to plan your actions. Each turn lasts 8 seconds. During that process there's nothing you can do, as the decisions have been set in stone, meaning you gotta think well before committing to ending the turn. The enemies move in real time during those 8 seconds. So a grenade that you threw at their position might not actually get them because they have moved on by then. If you ever had the chance to play Frozen Synapse you'll feel right at home here. I like this style of this gameplay a lot personally. A full on tactical pause is great, but it makes for a different game. Broken Lines is all about positioning, flanking, using special abilities and anticipating the enemy actions. It's good.
The story seems very mysterious at first, especially if you keep picking wrong missions. However all you gotta do is to listen to your recruits instead of the veterans, and do more investigative work to understand what's going on. It's not that complicated once the cards have been laid out on the table. The atmosphere really shines through though. The enemies you face are intriguing, as nothing is as straightforward as it seems at first. I got in my opinion the best ending out of the five available ones, which really could just have been cut down to three. There's three extraction endings that differ little from one another, and make little sense with certain choices preceding them.
The narrator as almost always in other media is freakin' annoying and should have been cut from the game completely. All she does is take away from the game. I kept skipping all of her word salad nonsense right before the final cutscene.
I'd say it's worth picking it up on sale, but your mileage may vary on this. It's supposed to be played several times in order to understand the story... unless you luck out like I did, After that there's little point in staying. I'm yet to try the complementary DLC. But even now I'd say it's worth it picking up on sale.