There are some things I make all the time - pasta sauce, vegetable soups that seem to come out differently each time I make them. Sometimes good, sometimes not.
I just made a beef vegetable soup from an online recipe that had alot of reviews - all good ones. And yet when it was done, I didn't care at all for it. Now I feel guilty that I should eat it anyway because I spent alot of money on ingredients and made a big pot of it.
I just look at it like it's good to try new things - if you don't ever try new stuff, you might be missing out on some good things in life. Not everything is goingt to be a winner - and I have to admit that eggplant is one of those tricky things to cook. Keep trying!