Enjoyed this game more than I expected to, given the somewhat lukewarm reviews on here. It is a Tactical RPG and has the usual 'take 4 of 8 party members on missions involving turn-based combat on a grid, level and buy gear between missions' gameplay that you'll recognise from Banner Saga, Fell Seal, Regalia, Shadowrun, etc.) Bottom line: if you enjoyed any of those games, you'll enjoy this too.
Story-wise, we get a kind of dark fantasy retelling of the Arthurian saga and while the story is nothing spectacular and a fairly simple 'unite the kingdom & save the girl from the big bad' kind of setup , it is well-told for the most part (with some strange dialog choices here and there however) and will keep you engaged to the end.
The gameplay is stronger than the story with the tactical experience actually pretty rich - the various party members you recruit have a range of unique abilities and upgrades that make them play quite differently to one another, and that make for different strategies depending on who you take on missions. Terrain provides another layer of tactical complexity with exploding barrels that impose various debuffs, ledges you can push enemies off and mechanics that reward attacking from behind and on high ground. The only let-down is fairly poor AI scripting: enemies with ranged attacks just stand and wait for you to come to them and melee units often use their action points to chase weak units rather than making attacks. Still, enemies hit hard and your own dudes are squishy and healing is scarce, so the game stays difficult enough to keep you engaged, especially in boss battles.
The game is very linear and takes maybe 12-15 hours to beat at a fairly leisurely pace, and there's not much replay value. Still, if it is on special and you've played and enjoyed the other titles mentioned above, it is probably worth your while.