Respects to Yooper, but I've found that the lower end WinExpert kits turn out better when made as a 5 gallon batch, instead of 6 gallons.
Also, some minor tweeks will help you to make even lower end kits taste better.
1) If oak dust is provided, think about ditching that for oak cubes or adding the cubes in addition to the dust.
2) Test the acidity of the wine. Adding tartaric acid, as needed, will give you a better tasting wine with a longer shelf life.
3) Don't be afraid to let your wine age in the carboy for longer than the instructions tell you to.
Try these instructions from Tim Vandergrist of WinExpert: