Don't believe anyone who says that the game is short. If the game is too short you better choose higher difficulty.
I was pleasantly surprised when I realized I don't need to check every alley and corner for any FEATHERS, STATUETTES, CODEX PAGES, COINS, BOXES OF AMMO, POWER-UPS, QUESTION MARKS, HEALTH KITS, MAPS and other dumb sh*t.
Put any of those elements into Kane&Lynch2 and you will have 6 hour game, two more - and the game is 10 hours long. I missed games like these. Why do you think people like Crysis, Hitman, Modern Warfare, Bad Company, Mass Effect? No need to look for stupid sh*t. Sometimes I like to look around for stuff and I play Thief.
I think this crap-collecting trend in the games came from Japan where they have no personal life and want play one game forever, because they actually fall in love with the characters!