If I had to name worst part of Inquisitor: Martyr so far, it would be camera, aiming and moving.
Camera works awful, just take position in cover near door and you can't see where you are trying to shoot. At all. Walls that should be transparent aren't and interfere with your view all the time. You rotate camera to look from another direction, but desirable area falls out of your FOV.
Aiming is weird, you target enemy with a skill, but instead skill is directed at wall, cover enemy is hiding behind, or at the ceiling. But not at enemy. Every single time enemy is behind something you can be sure that skills that target area won't hit it.
Piercing skills and beams have targeting issues as well. Half of them pass above heads of crouched enemies and can't target mines or nurglings at all.
Firing from cover has aiming issues as well - player can suddenly stop firing in a direction as if he can't turn there, although he fired in that direction a moment ago. Also shooting from cover melee enemies that got close is impossible - you start hitting your own cover instead.
Aim skills often do not allow to choose location or charge skill (all charge skills suffer from that). Player fires immediately instead.
Moving is bad as well. Instead of moving in direction where your mouse pointer is, character moves to the location mouse is pointing at via calculated route using same pathing AI does. That results in erratic behaviour on multilevel maps, as game can't determine what mouse pointer is actually pointing at.
Performing evasive maneuver in a crowd of enemies is hard, as clicking on enemies will result in attack, while clicking somewhere outside results in character running in weird direction, picking the most dangerous route.
Being able to control character movement via keyboard doesn't help, as in that case keyboard and mouse start to contradict each other. Attacking enemy with a mouse results in move and attack order which beats any keyboard movement input and results in character stuttering trying to move in range to shoot target and in between shots moving a bit in a direction player is guiding with keyboard. We need either an option to move in mouse direction, or option to fire at mouse pointer direction without a move order, even if target is outside range.