Meh, D:OS lost my interest with the second map. Bland enemies, awful writing, generic storyline, unimaginative world, atrocious color choices, cartoony graphics and aesthetics, extremely limited viable character and party compositions, and an "open world" on rails.
Just skip it and focus on WL2 and PoEt.
I finished D:OS and you have hit the nail on the head on every single point you made. It is Magicka with turn-based combat.