The way I make mine is very easy and I havent had complaints.
Take 2 to 3 tablespoons of corn starch or flour which ever you have on hand, place it into a container, add 3/4 cup of water, place lid onto container and shake it till the water and flour are smooth, put aside (I like to use cornstarch because it mixes better)
After you remove your turkey stir up the bottom of your roaster, take all you dripping and place into a saucepan, add 4cups of water to the drippings, bring to a soft boil, slowly add the cornstarch mixture while stirring the dripping mixture, add a little at a time until its at the consistancy that you like. At this point you can add any giblets or such if you like. add a little salt and pepper to taste. TADAH! Gravy.