Recs.
Updated
SpecsUpdate
Pros
Pro Playable multiple times
There are so many small details in Fallout 3 that you can't possibly notice them all in one - or even a couple playthroughs. You can also play differently each time - karma can sometimes open up or close different options. At the end of each playthrough, you will see a recap of all the important decisions you've made thoughout the game.
Pro Deep combat is very satisfying and somewhat realistic
Combat isn't a straightforward affair. You have multiple weapons available to you, and each acts very differently. You can use VATS (Vault-Tec Assisted Targeting System) to take a moment and target something specific - a leg, the head, or an arm for example. If you get a hit on an arm for example, your enemy will likely drop any weapon they were holding. Similarly, shooting them in the leg means they won't be able to move as quick. A headshot disorientates your enemy - although all of these same effects work against you as well.