Some interesting comments on this subject.
In the UK at least, FIC instructors tend to be CFI's/examiners in varying capacities henceforth are busy people - that's just the nature of their job and as a student you must be prepared to be a little flexible.
Everyone knows that a hard instructor will get the job done but may not be the most fun to fly with. As a customer it is your perogative which you chose to fly with and yes, if you are experiencing an FIC instructor who you may not be best suited to then it's a good lesson towards evaluating which kind of instructor you eventually wish to become.
Personally, I prefer to see my students enjoy their instructional flights and in doing so put them at ease which in turn leads to improved understanding. Other collegues around me prefer the strictly business approach and often halve their lesson time but my take is that the PPL is a recreational licence and the people paying money to aquire one wish to enjoy themselves (as well as being safe obviously).
For professional flying licences I think the strictly business approach is the way forward and students expect it more - I certainly did.
VFE.