I've tried both wet and dry cat food. The wet food was very bad, but still relatively edible. It was also the one I expected to be good (it was one of those really expensive and premium brands). The dry food, however, tasted exactly like fried anchovies. It wasn't bad, honestly.

Edit: I've also tried dog cookies. Most of them are bland, because their main ingredient is actually ash. I don't know how healthy that is. They're also pretty hard. However, there's a specific kind that is actually very tasty, and I liked it. It's way cheaper than actual human cookies, so I still buy them every once in a while, as a treat. I still don't know if they're super healthy to eat, but I've never felt sick after eating them.