Is Pilates exercise good for back problems?

Back issue. Any exercise program which is consistent, emphasizes core strenghening and stretching is valuable for healing most situations which involve the back. One key aspect Is to start slowly and increase incrementally If one stops for awhile then you adjust accordingly by decreasing time and intensity of your program .
Yes/No. The best exercises for low back are gentle core strengthening exercises. A great program for this can be found at www.therehabzone.com.
Can be. If your back problems are not neurological then pilates can be a great way to recondition your back and abdominal muscles to provide the strength needed for your back. It is also good for stretching the muscles and giving the back the upright support it needs. You should be sure you have a licensed instructor and ask your doctor if it is appropriate for you.