tbh i love hearthstone modes, except arena, but merc was a real scam that wasnt developed fully or with foresight and just rushed into the market. How couldnt they think of duplicate protection or a way to spend leftover coins even at a loss conversion, there is no incentive to buy packs at all. This needs to be "hotfixed" "rushed" into development ASAP. You open twitch and nobody streams mercs, its all BGs , the mode is terrible to watch/play. Even duels is more "fun" and "meme" moments, this is literally one dimensional.
Heavily dependent on tasks, PvE is brainless grind where it could have been an "adventure" see how far you can go with a group of mercs.
There should be a a fighting pit with no equipment allowed (think standard/wild in regular HS). Maybe even add a mode that allowed you to switch equipment between bench rotations so there is actually more incentive to "Grind"/buy tasks/coins, and more "strategy". Literally there is so much room for development but they hire retards at blizz noawadays that have no game development experience.