I give fancy feast to my cat as a treat too... she's on Nutro (for fat kitties
) as her regular diet. If you read the ingred for fancy feast it actually don't look too bad.
I recently changed my crews food in the name of less hair around the house (they were healthy otherwise). My Dog is on Performatrin ultra and the cat is on Nutro... in one month I've noticed a big difference in both lack of hair everywhere and they both look better (and I though they looked great before)
I didn't like the ingred on nutro for my dog, that's why I opted for the Performatrin ultra, but the cat foot looked good and seems to be doing the trick.