Control. Liked it despite being in 3rd person view up until the mezzanine fight an hour or two in, then realized that the enemies are just dumb high DPS bullet sponges, the PC is a low DPS squishy and fighting from a cover or any other tactical approach I'm used to doesn't work.
EDIT: There was also a spellcrafting mod for Skyrim where the endboss was immunebto all magic and would teleport away as soon as you got too close while summoning a bazillion powerful minions. At level 50...60 it was litwrally impossible to figjt the bastard. After many tries I just console killed the bugger and was done with it.