Since I had played all the most recent Killzone games I thought I would be a man and run through it on the hardest difficulty, Veteren. Ugh, was that a mistake. I stopped playing it multiple times and my absence lasted months both times. The enemies were predictable but would cause damage at a unfair rate. There were a few times that I would forego the gunplay and just run past them hoping to reach the next checkpoint and avoid conflict altogether. Even though it took me almost a year to beat it, the gameplay clock said my play time was less than 5 hours. I did not enjoy those 5 hours.
Overall Killzone: Mercenary is a short game that should be played on its easiest difficulty. There is some replay value if you want to replay the missions with certain parameters, but I would only recommend this if you a prepubescent teen who hasn't realized that girls make your man region grow.
BSmith Approval: 5/10