This isn't much help in this case, but if you buy a French wine, look on the label for 'appelation controlee'. This is the highest of the quality marks they give their wine. The lower quality wine will have 'vin de pays' or 'vin de table'.
That is my only bit of wine knowledge really.
I have moved away from the heavy rich and fruity types of wine. I tend to buy a Bordeaux white and a Beaujolais red. Both are in the weakest end of the range.
i buy whatevers on offer cos lets face it i am just gonna pour it down my throat and not savour it