Depends what you mean by dry. Strictly speaking this means with little or no residual sugar. Harsh, bitter, sour, overly acidic and astringent are something else. If you have noticed a significant reduction in quality, I suggest you contact the manufacturer and complain. I had the same experience with a Youngs wine kit and it turned out that they had been supplied with sub standard concentrate from a supplier who they no longer used. Replacement kits were supplied free of charge and were found to be of the previous acceptable standard. There appears to be a shortage of supply of white grape juice recently, which can lead to higher prices and/or reduced quality.
I found a similar problem with a red wine kit from another manufacturer, who denied any deficiency, but were quite happy to supply a replacement free of charge.
The fact of the matter is that these kit manufacturers have no control over the raw materials supplied to them, any more than those suppliers have, unless the **** hits the fan, like the horsemeat scandal.