Funnily enough, I brought this in early access and in the same day it's released as a full game...which feels quite odd because from what I've played I've gone with the expectation that "they are going to add more" (which they could still do as well as add fixes).
So instead of a early access review, I shall do it as a full one.
The game is nothing on the level of a triple-A title, this is a cheap n' cheerful FPS, the voice acting is sub-par, the shooting is...un-remarkable, the aestetic for the levels remains the same throughout the game (save for one horde mode map) but does good enough and has a nice arcadey vibe to it that reminds me a bit of timesplitters, mostly because 80% of the shooting, I shot from the hip rather then use the iron-sights, the iron-sights feel like...they just aren't needed, the gun's are plently accurate enough without them and the sights on the guns themselves...well...they don't feel reliable to land percise headshots.
Dead Effect for me in the begining felt quite unremarkable, the weapons were serviceable, the enemy's were few and my combat options were limited but once you progress through the story, buy some upgrades, become stronger and more experianced, the more fun it becomes, so if you put time in to it, it gets better as you unlock bullet time and a AOE attack, both have recharges.
There are plenty of weapons and plenty to upgrade them (although the upgrades are run of the mill that boosts reload speed, mag size, damage etc.).
It's a nice little game that if you are looking for a new FPS to play just to waste time, this is a good choice,