First off, I am not an expert on Diabetes, however, after living with this disease for over 12 years I know a few things...
A normal glucose is anywhere between 80-120, however if your patient is normally ranging in the 200's, an blood glucose level of 120 may induce hypoglycemic side effects.
However, it is completly wrong to say that I'd rather my patient run high--- high glucose levels DO have side effects short term and long term. A patient with high glucose level may feel nauseous, sick, tired, lethargic.. also, high glucose levels do not promote wound healing, in fact, it prolongs healing!!!
Finally, do not be afraid of insulin! Given correctly it is a safe drug... It allows many diabetics to LIVE!
Ok ill stop my diatribe here...I have seen that nurses do not understand this disease. Sorry if I sound preachy, it is just so frustrating to see!