I gotta throw my 2 cents worth in here. Unofficial patches/mods are always worth a look. Especially if you've passed the game the first time and would like a different experience the next time around.
I have a folder on my computer that has over 70 gigs of mods and unofficial patches. Most of that 70 are for Fallout 3, Oblivion, Morrowind, Sims 2/3, Civ 3/4, Baldur's Gate 1 & 2, NWN 1 & 2, and Forgotten Realms Unlimited Adventures. Those are just to give a different type of experience than the first time I played like Civ 3 has a great mod called the
Warhammer Fantasy Mod that let's me a Civ 3 game with Warhammer troops.
Fallout: The Rebirth is also another must have mod for me. It let's you play a civ game in the Fallout Universe. .
But REE (he seems to have disappeared
) asked about unofficial patches and those are a different kind of beast than mods. Most unofficial patches are a must especially for older games like for fallout 1 & 2, Arcanum, System Shock 2, Wizards & Warriors (they sorta have some unofficial patches that get that dang game working), Bloodlines, Temple of Elemental Evil, and the the superb
TSL Restored Content Mod (not by team gizka btw) for KOTOR 2. These just squash any bugs, restore content that the developers didn't get around to or like in the unofficial patch for Fallout 2 it first and foremost squashes the tons of bugs in the game and makes the game playable on modern computers. Even if you get F2 to run without
this patch on your modern computer you'll have all kinds of problems. Like when you get to the map screen for F2 your character will travel around the map at lightning speed.
So for mods I would say that is totally up to your playing preference. Some people prefer to stick to the "developers vision". I still think those people are nuts for not wanting to try something new with one of their games, but to each their own as they say. However, most unofficial patches stick to the intended vision and either make it playable on today's computers or squash bugs that the devs didn't get around to getting the first time around.
There is no good argument, imo, against using an unofficial patch that just does what the devs didn't get around to when they released the game. Prime examples of that are all the games released by Troika. The community has done what Troika didn't have the time/resources to do in the first place and make all of their games almost completely bug free and totally freaking awesome