Question
The flowers on my roses look so dry, even they bloom, but they die out pretty fast. Some of them just fade before fully open.

Answer
Do you think the roses are getting enough water? Sometimes one gets the idea that they have watered a rose very well only to find when they check how far the water has gone, they fine it didn't go as far down as they thought it had. Roses need to have water go down to at least 8 inches if possible and deeper if the weather gets hot. It is not unusual if you are getting high heat for roses to look the way you describe and will return to looking better when the weather cools down. Also some roses naturally will fade in hot sun and are better off grown in part shade. The other reason could be an tiny winged insect called Thrips but they will cause small brown spots on the rose petals so you can see what they have done.