Fallout 2 has everything that gamers loved in Fallout 1, and even more. This is a game for adults, as it has all sorts of sexual situations (no nudity or sex depicted onscreen, though), violence, death, and drugs. As with the first Fallout, the gamer does not have to choose one particular style of character. Diplomats, thieves, and tanks can all win the game.
The game starts off with a Quest, just as in Fallout 1. Along the way, the character encounters other people with their own problems, NPCs that will join and add their own skills to the party, and just plain Easter eggs. The NPCs can now wear armor, and the player can tell the NPCs to take off their armor, put away their weapons, try not to hit the PC while using a burst weapon, and the amount of drug use that's allowed. The NPC party members can have skills such as Science, Healing, and Repair, and will attempt to perform those tasks for the player. The PC can also shove any character aside, so that the PC won't have to wait for someone to drift out of the doorway or corridor. The game has some improvements on the original in other ways, too. For instance, when looting a body or container, the player can choose to "take all" instead of transferring the ammo, weapons, armor, and whatever else in one click. This is very handy.
There are plenty of side quests to do, and lots of areas to explore. It's possible to get a running car, and upgrade it a couple of times. The car serves as both transportation and storage area. Some weapons and one kind of armor can be upgraded, plus the character itself can have some modifications.
As a general rule, I don't particularly care for futuristic games, but Fallout 1 & 2 are so engrossing, and require such puzzle solving, that I really loved both of them.
This game is a lot of fun, and has plenty of replay value. I strongly recommend playing the first Fallout before this game, because there are a couple of spoilers in this game.
(Edited because I made a couple of typos)