There is really no excuse it seems in this case for the wrong address. "Follow the leader" syndrome, tunnel vision, seeing what you expect to see, ect., are probably factors, but not excuses.
As far as the shooting, sometimes there is no "correct" solution. Wrong address or not, someone comes to the door with a gun in their hand (I am going to make a big assumption here, that it was pointed at the officers). Do you hold your fire, hoping the man pointing his gun at you doesn't kill you, or do you shoot in defence of your and your partners lives?
And the wife. Even if you know, at that point, you screwed up and shot an innocent man, when she comes into possession of a gun, and starts shooting at you, do you protect yourself, or stand there and take a bullet, or two, because you feel bad? Maybe run and take cover, followed by a little communications to defuse the situation, which it sounds like they did.
Provided they announced themselves clearly, multiple times, were in full uniform, and the poor slob who answered the door was holding the handgun in such a way as to be an immediate threat, I don't see any glaring mistakes, other than the wrong address thing, which is of course, a big deal.... One thing not mentioned in the article was whether or not any of the officers watched the entrance area thru a window while the other officers knocked on the door. Might have seen him coming with the gun and been able to take cover, and possible defuse things before any shooting started.
I have knocked on my share of doors at night, and always made sure the contact officers were clearly dressed as police officers, not Ninja's. Always made sure we announced "POLICE" loud and clear. Always positioned ourselves with an escape route and cover in mind, and with domestics, would often have the dispatches stay on the line with the caller, and try to have them come to the door via the dispatcher. Watching thru a window is basic 101 stuff.
I really don't like second guessing these things, especially without all the facts.
Larry