What Fallout 3 Reborn Version 5 is:

A WIP mod, that aims at creating a more action-packed and intense Fallout experience. No more will you see an enemy shrug off a bullet to the brain. If you are tired of guns that feel like airsofts, this mod is for you. If you are tired of the brown and dull wasteland, this mod is for you. If you're tired of unrealistic radiation, this mod is for you.

Armor and guns are far more realistic. A headshot from a 9mm handgun usually kills instantly. Armor starts giving you almost complete protection (75% or 50%) against any threats, but depending on the type of armor degrades very quickly if its simple Vault armor or over hours of constant battle in the case of the T51-b. Armor is more health-based, meaning your armor gets much more DR, but much less health.

Explosives have some... fun changes. Any explosion is liable to send you flying or knock you over. The distance you fly obviously depends on the explosion type. Nukes will send you up to 50 meters, while an Anti-Personnel Mine will send you ten feet in the air... without your legs. Also, some high-caliber weapons and blunt melee weapons can knock characters over if they score a critical hit.

Drugs and food now have more drastic changes, much more realistic and time-based. There is no more instant healing, the average Adrenaline (Stimpack) takes about 2 minutes to give you 120 health.

Weapons and items have lots of changes, both major and minor. Some weapons have been totally redesigned, while others simply sport a new name and use a different ammo type. All ammunition now have realistic names, or as close as I could get (I'm not a gun nut, so forgive me for any mistakes). Items also feature new names and uses.

Radiation has been redone to act way more realistic. At 1000 Rads, you are immune to further irradiation, but lose 10 health a second until you croak or if you're lucky, get healed. I also added a "glowing one" effect to your character at 600+ rads. When irradiated you can suffer crippled limbs, lose health slowly, and see a slew of fancy effects.

There is so much more that I could never hope to document it all. I'll leave it for you to find out as you play, have fun and remember to approach the game differently as there are some drastic changes, your old playing style may not work as well in this new "wasteland". Have fun!