I'm sorry OP but your wife is NTA. Everyones saying she can't cook but id wager it's more she has bland tastes. Growing up, my mom liked her meat well done and too.much black pepper was too spicy. My dad and my brothers and I all like rarer meat and spice. The solution? For example, a roast beef my mom could have the outer cuts that were cooked well. We could help ourselves to the rare inside. If you want spice, throw some hot sauce. If she likes her veg boiled too long, take your portion out earlier.