I have one with a myriad of health issues -eczema, allergies, a weird undiagnosed dermatological condition that has all his doctors stumped, and one with SEN, as yet undiagnosed but likely high functioning autism. I wouldn't be without them.
What I dislike about being a parent: not being able to have a shit in peace, the worry when they're ill or hurt, that it's never quiet.
What I love: their lovely little warm bodies snuggled in, their cute little snores that are barely audible, tiny little hands that close tightly around my fingers to cross the road or just because, badly folded pieces of paper with one line scrawled on it - "Mummy, I made you a card", kisses and cuddles, the pride when they do something for the first time, or when they do something better than they did last time, that it's never quiet. And a million other things besides.
Having kids is life-changing, and only you can know whether those changes are going to be ones you can live with. But I would say, unless you're sure you want them, don't have them. You really need to be sure.