Interesting story. Thanks for sharing. Some thoughts:
1. Yeah, opening the door was a mistake, but if everyone made perfect instantaneous decisions every time, life would not be nearly so...interesting.

Your pal made up for it by talking everyone out of committing any nonsense, and good for him. Best possible outcome. Some have suggested -- and I might have done so myself -- that ordering them out immediately would have been the proper action. In hindsight this looks good, especially on paper, legally speaking, if a fight had broken out, but I think doing so may also have very well precipitated a fight. In fact, if your surmise that they came to the door looking for an excuse to fight, it probably would have kicked things off. You and your buddy were on the spot, you saw the verbal and non-verbal cues, apparently you played it correctly -- including offering booze instead of fighting words. Well done.
2. I am as much a nut for legal detail and being prepared for the aftermath and all that as anyone, and it is great fun to dissect how the legal machinations might play out, but if that is what you -- or any of us -- is thinking about when threatened, we are setting our selves up for failure. If you are confronted with a threat, you should not be focusing on what the DA might think about it afterward, you should be focusing on what the threat is, and how to best disengage or counter it. You have to survive, preferably without being maimed for life, before you even get to the that point, so focus on that. You don't blast somebody for mouthing off, but neither should you hesitate when threatened with imminent deadly force or serious injury. Even if your own stupidity got you into a bad situation, you have to survive it relatively intact to have a chance to plead your case.
3. Here's where I seriously disagree with some posters above -- refresh your coffee, this is a long one: Yes you were seriously under-weaponed for what you were facing. I have a five shot snub too and I like it, but no they are not
first-choice self-defense guns, especially if facing more than one opponent -- they are specialized up-close back up guns. You were quite possibly looking at a four vs one fight, with at least one of your opponents armed with a knife at close range. (i.e. could you really count on your buddy to pitch in and fight? Probably just you).
I don't care how many people have been scared off or killed with one, there are a lot more who have been shot with handguns of all calibers and kept right on moving -- meaning they were still able to fight and kill and maim. It doesn't matter that it is technically possible to kill five people with a five shot gun -- what you need is as much probability that you can STOP someone -- or several someones -- as fast as possible before he shoots you or guts you with a knife, or simply bashes your head in. There are no guarantees, but your probability of stopping someone is much better with multiple shots for
each opponent. Yeah maybe after the first shot everyone would run out of the room, but that is relying on hope and chance -- thin reeds.
You mentioned you have Gold Dots -- they have a very good record with police shootings, but they are not magic. As a first responder I treated an acquaintance who accidentally shot himself lengthwise through the thigh (about 8-10 inches of flesh) with a .40 Gold Dot -- and didn't even
know it until he picked the bullet up off the floor and wondered why it was fully expanded. In fact, there was so little pain, and he was so embarrassed, he did not call 911 and thought he might be able to "walk it off." He changed his mind when the pain and swelling hit, but that didn't happen for several minutes. He wasn't even pumped up for fight, he was just clumsy putting a gun in his pocket. Had he wanted to clobber someone, he was still perfectly capable of doing so.
There's a nice long thread here
http://warriortalk.com/showthread.php?t=57406" onclick="window.open(this.href);return false; with lots of first hand accounts of being shot. What's interesting in many of these, and other accounts I have searched out, is that most people who are not killed right away
do not even realize they have been shot, never mind stopped or even slowed down. That means to stop someone with a hand gun you are going to need to either put one right in the CNS (and even a brain shot is not a guarantee) or you are going to need time and several rounds into various vascular and mobility structures to stop them. Five shot snub versus three opponents might do the job, but it is a weak bet. One or two shots from any handgun, snub or 1911, is not a good bet. Better than nothing, but at the ranges you were talking about, maybe not even better than a knife.
Get a hi cap semi-auto -- it really isn't that much more difficult to carry than a snub -- and maybe keep your snub and a knife in your pockets for back up. No guarantee of success, but much better odds than a snub all by itself. (and oh BTW, even if you did have some speedloaders and strips, when were you going to reload in an apartment living room-sized fight with three guys and a gal?)
4. Some new, wiser friends might help, but even "sensible" people find girlfriends or boyfriends that turn out to be loonies, and then you have to deal with that.
Good luck.