I drank water from toilet to increase health. 10/10 would buy again.
EDIT: Wow, I didn't realise that this "review" had got so much attention o_O. Allright, since I've played this game for nearly 600 hours, I'll give you a serious recommendation.
If you're a fan of The Elder Scrolls series like me, you'll love it. Fallout 3 is kinda similar to TES IV: Oblivion in many aspects. Don't expect a fast-paced shooting gallery because combat's the weakest spot in the game. Fallout 3 is all abount exploration, moral choices and immersing yourself into the world. Walking lonely with your dog like two little dots in the Capital Wasteland, crawling in the dark while exploring an abandon Vault, punching a ♥♥♥♥ing ♥♥♥♥♥♥♥ in his face because he annoyed your girl, blowing up a city to become an evil based... are just some small things among thousands of insane ♥♥♥♥ you can do in this game.
What I love most about Fallout 3 is the dark atmosphere. In this game, you really feel like you're in a dead world. You rarely find a house that's not completely ruined, you will meet many kinds of people, from poor citizen who can't protect themselves from Mutants to cannibals and slave traders. The diversity is undeniable, the world is beautifully crafted in a dark and heavy tone. Fallout 3 sometimes doesn't take itself seriously, it's the result from a script filled with black-comedy, from story, dialogues to the ridiculous amount of gore. Fallout 3 is an over-the-top game, but it still managed to maintain both dark tone and comedic writing.
Combat is... well, not so much things to say. You can find bazilion of weapons, from a small pistol, sub-machine gun to things that can blow up a god damn building like a rocket launcher called Fat Man, a holy-♥♥♥♥-it's-on-fire machete with a name that I can't spell properly and a gun that can shoot junks you put in called Rock-It-Launcher (I wished it allowed me to put someone's head in it). However, the impressive amount of weapons can't prevent the combat system from being dull. 3rd person camera works better than it does in Oblivion, but I found it a pain in the ♥♥♥ to use it in combat so I recommend sticking with 1st person camera. This game has a turn-based system called V.A.T.S. In the first Fallout games, this point counts the actions that player can use, from moving to using your weapon. In Fallout 3, this system serves as an aimbot helping you "mark" enemy's parts of their body (it has percentages, so don't expect to get 100% YOLOSWAG420). The problem is, VATS can be abuse, you can shoot an enemy, run back, wait for it to regenerate and bam, get back to the warzone. The mechanic of this system is a little bit weird and I'm not sure if it's a positive or negative point.
Shooting people isn't something special, you met a bunch of bandits ? Keep the distance and shoot them. You found a big ♥♥♥♥ing bear ? Keep the distance and shoot him. You met 10 Enclave soldiers ? Keep the distance and shoot them. You met a mother♥♥♥♥ing Deathclaw ? Keep the distance and shoot him. Combat is kinda dull, repetitive and it only feels decent if you manage to find creative ways to punish enemies, like putting a grenade inside a bandit's pants and see him explode or firing a flamethrower while sneaking behind an Enclave soldier.
Graphics looks kinda ♥♥♥♥ty by today's standard, but you can always find some enhancing mods so that's not a big trouble.
My conclusion: After 580 hours in this game, I had a very good time immersing myself in a dark, dead wasteland. Combat is dull, karma system doesn't make sense sometimes, but other aspects has hidden those shortcomings perfectly. I'm not a Fallout hardcore fan, but now I want to be. 9/10. AND GOD DAMN IT BETHESDA, RELEASE FALLOUT 4 ALREADY!!!.
P/S: It works fine on Windows 7, at least for me.