PSX-Sense.nl 10/10
It is the shooter par excellence and the best first person shooter ever released on a handheld.
TheSixthAxis 10/10
While Mercenary might not be the best shooter in the world, in its own field – as a handheld title – it’s almost perfect; there’s no other experience like this on a device as small as this. And, judging the game from that perspective, it’s an experience that will stick with you for a long time, much like GoldenEye, Call of Duty 4 and other revolutionary shooters have managed in the past, and one entirely worthy of its acclaim.
CheatCodeCentral 9.4/10
The handheld FPS formula has finally been cracked, and not a moment too soon.
Eurogamer Italy 9/10
Gaming Nexus 9/10
An excellent adventure that is meant to get you quickly into the action and give you all of the amenities you would expect sitting at home in front of the big screen. The only modifications made to this adventure have been to ensure that it is all-action-all-the-time, and that is much appreciated when gaming on the go.
God is a Greek 9/10
Incredible to look at, to listen to, but most importantly to play, Sony should be pushing this one to the moon as a prime reason to own their excellent handheld.
IGN Italia 8.5/10
Vandal Online 8.5/10
It's an outstanding shooter that offers a solid experience beyond the incredible graphics it shows on Vita. With this title, Guerrilla Games has proven that they are not "mercenaries".
Eurogamer Spain 8/10
The campaign is short, yes, but is built in a very intelligent way to be replayed on different occasions, and the multiplayer can be a major boost if it can capture a large enough and active enough community.
Gamereactor Sweden 8/10
Eurogamer Germany 8/10
Pushsquare 8/10
Graphically astounding and packing some serious online firepower, this is the high-budget handheld hit that you’ve been waiting for.
Hardcore Gamer Magazine 8/10
It’s not a game without its faults as friendly artificial intelligence can obstruct progress and I ran into a number of glitches throughout the campaign, but with an addictive multiplayer and some of the most creative ways in using the handheld’s technology, you’ll have a tough time finding another experience like this.
Gamesbeat 8/10
It’s a polished shooter, and it’s undeniably fun to play. Still, set up against console shooters, it’s really nothing special. But as a portable game, it offers an unrivaled experience for anyone looking to get their FPS thrills away from their PC or TV.
Gaming Trend 7.7/10
While the pure combat in Killzone: Mercenary is well-executed, the freedom of choice never comes to fruition, and it smacks of lost opportunity. Thankfully, its absence has no impact on the entertaining multiplayer modes which are worth returning to again and again.
Everyeye.it 7.5/10
PlayStation Official Magazine UK 7/10
The closest Killzone Mercenary comes to having a thing is in its touch controls, and as satisfying as they are the marriage of console shooter and iOS game doesn’t elevate it into the realm of the exceptional.
Joystiq 7/10
While it's hamstrung by flaky multiplayer functionality and a lack of new ideas, it is impressive just how well the first-person action of the Killzone franchise has translated to the Vita. As competent as it is, however, Killzone: Mercenary is teetering on the edge of being something truly great.
EGM 6.5/10
The crowded control scheme, uninspired campaign, and limited multiplayer options are completely outclassed by most home-console shooters. If, however, you’re truly desperate to fill that gaping genre hole in your Vita’s library, you won’t have a totally miserable time here.
Videogamer 6/10
The fact Mercenary has such strong on-paper ideas only makes its lack of ambition even more disappointing. It’s a smart, fun shooter, with the exact structure needed to slim triple-A FPS down to pick-up-and-play portability, but it never comes through and capitalises on its potential.
Nowgamer 5.5/10
At its most basic, shooting guys in the face in Killzone: Mercenary can be enjoyable but never gives the player any credit in any other facet of the game. Not to mention a repetitive, uninspired mission structure and pocketfuls of missed opportunities, the campaign length coming in at just under four hours.