Hey, I know what you mean, man. I usually cook for myself (big portions take too long) but when I share noodles or rice or quesadillas or whatever, my sisters seem to enjoy it. And then my grandfather comes in and says, "Whatever you're cooking smells disgusting" or something to that effect. He always tells our guests that I'm a horrible cook (despite the fact that he hardly ever eats my food!) and in general just insults the way I make food. This is kind of annoying because he hasn't even tasted whatever I'm cooking! When we go out to eat, or if someone else cooks for him, and we ask "how was the meal", his reply is always "it was okay." Never good, and never bad. Just "okay." UNPLEASABLE ARGH.
If you enjoy it and your wife enjoys it, that means it must at least taste good. Which is pretty much the deciding factor, I suppose; as someone else pointed out, you're not going to live with them forever, so as long as the two of you are satisfied, all is good. And, hey, if you made something you didn't like, and they didn't like it either, that at least shows that they're on the same page. Maybe they're just extremely unpicky eaters, and as long as it's edible it's good for them. Or maybe they're not very verbose?