This has been a very interesting thread and it’s good to know what other people’s views on instructors are. In my experience, the most important thing when someone is trying to teach you anything (be it skiing or otherwise) is that you are on the same wavelength. It doesn’t matter how many qualifications you have (or how good you personally are at what you do), if you can’t get your point across at the right level for your class and in a way that they are going to enjoy then it isn’t going to work. The best teachers are also able to adapt their style to the different ways in which people learn, some by simply watching, other need to know the theory etc.
Sometimes it is necessary to get technical, but only if those you are with know what you are talking about, otherwise you may as well be talking in ancient Greek! I sometimes wonder why certain people become instructors – I’m sure with most it’s because they have a genuine love of their job and sport and get a lot out of watching people improve and grow to love it as they do, however there seem to be some (in all walks of life) who do it simply to show off and boost their egos, in which case they shouldn’t be teaching at all.
As others haven mentioned, another thing that annoys me is those who think they know it all and are quite prepared to shout about it, when in reality they know very little at all. The real experts (who are not necessarily instructors) are those who quietly and helpfully pass on their knowledge without blowing their own trumpets and it’s great that there are so many of those on here.
I’ve also found that once you’ve mastered the basics, it’s sometimes possible to learn more from a friend simply giving you a few tips than hours of lessons with the wrong person, although if you’ve found an instructor who you work well with, stick with them as they’re worth their weight in gold.
Sadly as Ally has pointed out, in group lessons you don’t have choice who you get so it’s often a case of make do and try and enjoy your skiing if you get someone you don’t click with.