Though unasked for, I'll contribute my Metro 2033 impressions…
STORY:
At best, it might be described as "nonsensical." The story does provide sufficient impetus to cover the constant progression from one level to another, yet never reveals enough to substantiate the game as a whole. Indeed, it feels like the developers intended such: most likely in anticipation of creating a franchise, wherein said story might be expounded upon.
Pardon me if I'm being a little obtuse, but I have no desire to post any spoilers. Suffice to say, various characters make one-off showings in the story, only to rapidly disappear, while the player-character's background is never explained (and, thus, the reason for everyone's confidence and dependence upon them). The climax of the game, it's conclusion, is also suitably underwhelming (due partially to a platforming-esque sequence that proves too dramatic a shift in gameplay).
GRAPHICS:
The game features X-Ray engine graphical quality, indeed, my first impression was thus: Stalker 2.0
Unfortunately, this rendition of the engine features far less in the way of customization, such that I suspect most gamers will be forced to set the video options down an entire notch, as opposed to merely lowering the "shadow" quality. Having said as much, the game looks genuinely good even on low settings (I played on "normal"). Shadows and dynamic lighting are particularly impressive, though certain textures appear to be rather low-resolution (likely a concession to some unknown engine limitation) and the water-effects are not quite on par with other modern engines.
SOUND:
Frankly, where I'm concerned, sound remains the one true low-point of the game. Weapons lack punch, the fidelity is, at times, choppy, the voice-acting is subpar across the extent of the game (though this may be partially attributed to the poor dialogue, chock full of "jokes" that land with all the wit and impact of an anvil) and the musical score is so forgettable that…well, I've completely forgotten it already.
Oh, ere I forget, the "breathing" sounds come so often and with such volume that, if you are anything like me, you'll swiftly take every opportunity possible to remove your gasmask.
MECHANICS:
Shooting is both the game's forte and its downfall.
First, as noted, most weapons lack any sort of substantial punch, in either graphical result or accompanying audio. That, however, is made more severe given the relatively scant range of firearms available. Despite offering a few levels wherein new guns might be purchased, a little exploration will consistently yield even better ones. These, however, are merely the same old weapons with a component addition, such as a stock, silencer, bayonet or scope. What's more, these selfsame weapons will appear in the later "shops," such that I ended using the same weapons for nearly three-quarters of the game, given that nothing better ever materialized.
The so-called "survival" element is also somewhat of a joke, though newcomers to the field might find it engaging. A little exploration (and I mean that, it takes very little effort given the relatively on-rails levels) will yield more than sufficient ammo, of both the "shooting" and "spending" type, along with an abundance of healing items.
That, actually, is one mechanic I was deeply disappointed by: the "ammo is not only for weapons, but also for bartering" concept bandied about during the game's hype-season. This arises from the separation of "shooting" and "spending" ammo by the game itself and the fact that only ONE type of ammo is used in bartering. Frankly, save you make the mistake of holding the reload-button long enough, while using the proper type of weapon, that you end up switching from "shooting" to "spending" ammo, you will never be without sufficient "money." I actually ended the game with what, arguably, were the very best weapons in the entire game (all acquired long before reaching said end) and more than a hundred "spending" bullets. Considering your average gun runs as much and I spent nearly one-hundred and fifty on ammo (anticipating a challenge in the end that never materialized) along with one-hundred on unnecessary body armor (again, in anticipation of…yadda, yadda…), that's saying something.
On the plus-side, the recharging flashlight mechanic (use of such, along with night-vision, depletes your electricity), lack of a consistently viewable quest compass (one does exist, but requires a button press to see, thus it can be ignored; offset by the linear levels) and inclusion of quasi-stealth mechanics (which can be ignored, but largely to your detriment; these include glass on the floors to create sound, along with cans on strings, various traps and the ability to destroy light-sources) are all welcome additions.
Sadly, the game includes some rather jittery AI. Non-playable characters repeatedly spotted me through solid walls, monsters spawn at ridiculous and (at times) improbable locations, acting without the slightest sense of self-preservation. Again, this is coupled with other aspects of the AI: for instance, many of the fights where NPCs are concerned may be overcome by simple inaction. In all but one scenario where a NPC was present at my side, I never fired a shot: it conserves ammo (which turns out to be unnecessary, as already discussed), yet also shatters the illusion of abiding in a dangerous world. For that matter, the gas-mask mechanic seems tacked on. You'll never run short of filters. What's more, should you do so in the company of a NPC, they will give you more.
REPLAYABILITY:
The game comes off as neither more nor less replayable than any other FPS, falling far short of the bar set by the S.T.A.L.K.E.R. series. This is primarily a result of the stark linearity, yet also stems from the mechanical semblance it bears to so many other games. That is not only references S.T.A.L.K.E.R. (technically, it's inspiration) in-game, but also bears so many story-and-world-similarities, leads to a rather dismal comparison.
CONCLUSION:
All told, I would recommend a single play, if only to gauge its merit on your own. Personally, having uninstalled the game already, I will never be playing it again.