My cats get the Innova Dry Cat food and tuna, real tuna. I never really trusted ANY can cat/dog food, it always looked like vomit.
Just my two cents.
PS. My cats NEVER have any health problems, one is 9 going on 10 and the other is about 2-3.
I think the key is finding what works best for your pets. Admittedly, i raised 2 cats to 17 and 19yrs on nothing but cat chow and fancy feast they never had a health problem and obviously lived a good, long life.