Definitely one of the best game of PS3 if not the best of them all.
Let's pick the obvious positives that this game nails: graphic, atmosphere, voice acting, music and gameplay. The graphic is like Uncharted 3, but with more realistic gore and with a post apocalyptic environment that's like Enslaved with greens all around. The character's facial expressions itself looks almost photo realistic with great voice acting from each characters. It's easily the best graphic I have ever seen in any game period. The music fits the various situations of the game, ranging from beautiful soft somber music to upbeat when going into battle.
The gameplay itself is also excellent. It uses a modified Uncharted engine which makes hand to hand combat feels brutal and satisfying to pull off. Each enemy takes 7 punches to kill, but you can grab a weapon like a baseball bat to increase the melee damage that takes enemies out in 3 hits, or even better a bladed weapons that kills them with 1 hit, though weapons can break depending on their durability. Shooting weapons in the game feels powerful and awesome, but the game is very2 strict on ammo though. The max ammo that you can store for the handgun for example is only 21 bullets, revolver is only 18 while the rifle is only 7. You can upgrade the maximum ammo capacity but it'll only give you 1 bullet extra that you can store per upgrade, so every bullet counts. You can also build various tools such as a shiv or a small dagger and a Molotov cocktail to roast enemies into dust that can be crafted by having the right ingredients. If you want to see the game in action, look no further than the E3 2012 demo. You can do everything in the demo in this game, and as you can see from that demo, the enemy ai is smart and will react realistically.
People say this game is an action adventure survival horror game, but I personally believe it's more like Splinter Cell Conviction only without the ability to do mark and execute and without the ability to climb like a monkey, and a lot more gore. This game is very heavy on stealth as every encounter with an enemy always involves hiding from them and outsmarting them to take them all out. If you go out in the open like usual third person shooter games nowadays, you will die quick. So I suggest doing stealth kills really often by getting behind an enemy, press triangle and press square to immediately knock them out unconscious. Or if you are gunned down, either go behind an enemy or beat the crap out of an enemy up front until you can press triangle button to use them as a human shield. This is one of the save way to shoot at an enemy without getting killed, so I recommend this strategy often as it save ammo and it feels badass.
The upgrade system in this game comprises of 2 categories: weapon upgrades and skill upgrades. For the weapon upgrades you have to collect gears to get enough points to upgrade a weapon, and occasionally you will have to collect a toolbox to allow further weapon upgrades. Skill upgrades on the other hand requires you to collect vitamin pills....... yeah you heard that right, you have to collect vitamin pills to upgrade your skill. Pretty funny. I recommend stacking up 75 pills to get the useful skill of counter attacking the "clicker" mushroom head enemies and not buy the other skills before you got that. These mushroom heads are a pain in the ass to kill. You have to collect daggers, or shiv, to stealth kill them or else you will have to beat them up JUST in time before they grab you or shoot them from afar. If they grab you and you don't have that skill I mentioned or you don't have any dagger, you're instantly dead.
The game's multiplayer is pretty interesting and very well done. Unlike the usual multiplayer games with modes like capture the flag, free for all and team deathmatch, this game only have 2: raid and survivors. Raid is team deathmatch only with 20 allowable respawns per team, while survivors is like Counter Strike. At the main menu, you can choose between 2 factions: Fireflies (good guys) and the Hunters (bad guys). After you select your faction, you are given this interesting micro management minigame where you have to handle survivors staying in your camp. So basically, you have to kill enemies in multiplayer and collect blue pills as required by the survivors in your camp. If you perform well, the number of survivors will grow and the more they are the more items you unlock. But if you don't perform well in multiplayer, the survivors can get sick and get hungry which will decrease their numbers. Thankfully I never got to the point where my survivors got sick. Yet. It plays exactly like the singleplayer and it makes for some intense hide and seek battle.
Now the reason that the singleplayer game takes 16 hours to complete is because playing this game is like playing a game version of a road trip movie, having tons of exciting and might I add brutal adventure along the way. The core story is simple: go from point a to point b, but along the way you meet supporting characters that extend the game period for a loooong time. By the end of the game, both Joel and Ellie will develop in character and they will form a stronger bond together while kicking a lot of both infected and bad guy asses, which is pretty sweet. I will have to deduct 5 point from the 100 points that I will originally give this game simply because the story in the game has repeated cliches that makes you go "oh come on, that's bullshit!", which is just a bit of a nitpick from me.
Overall, need I say more? This is one of the best games of 2013 and of all time that must be played by all PS3 owners. This is definitely one of the main reason why people should buy a PS3 right now besides great games like MGS4, Yakuza 3-5, Ni no Kuni and the Uncharted series among other great games.