Mike,
Interesting post, and I'm glad your wife is enjoying the diving. My wife is the one who got ME diving. I got a few comments and questions:
I would like to know what things the evil

PADI instructor taught her that were just plain wrong versus incompletely or inadequately taught. There is a difference, n'est pas? And I mean universally wrong, not just non-GUE. I'm not giving you a tough time, I would like to improve MY teaching too.
When you teach anything (I teach other things, too), a compromise due to time constraints is often necessary. What is good to know? What is necessary to know? What exercises can be taught so that necessary skills taught at the basic level can develop properly without guidance?
I think you see what I'm getting at. Just because PADI dude didn't teach Yoopette to dive with her hands together or how to frog kick doesn't make him incompetent. On the other hand, if she never got a clue from him about attitude and buoyancy, he was deficient in his teaching, and probably contributed to the ranks of rototillers.
I can teach students what the GUE guy taught your wife. All I need is that extra weekend.
As a side note, I just cerified a guy who showed up to my first class all decked out in backplate, wings, long hose and bungied backup, asking if I would let him be in the class with his gear. (He was an internet-made expert). I said sure, since I've read and seen enough info to at least have a clue! Everything was neat and tidy except he showed up to the first pool session with a SS backplate, STA and HP 120 in a wetsuit. Yikes. Anchored to the bottom of the pool. Gave him an AL rental tank, and next week he had an AL backplate. Much better. Air sharing with long hose and snorkel is humorous at first, dangerous in reality. We got rid of that!
After that, skills are skills. He will need to go work with another instructor to learn any real "tech" diving techniques, but he now has the basics. This is also the second class I have taught where skills are done hovering and not on the bottom. (It's not such a big deal as it turns out). Except of course for FIN PIVOTS. ARGH! I have to apologize to every PADI class I teach about this, but standards require it, so I hold my nose and get it done. I am going to write a letter to PADI about this skill in OW, questioning its validity and reqesting it be dropped. Like they'll listen. Thank YOU for listening.
Neil