My daughters were both planned, and are both a joy to me. They are also night and day from each other. My older child will be 3 in August, and has always been a high needs baby. Not special needs - high needs. She's always been extremely clingy, emotional, and generally a very hard baby to deal with. I stayed home with her for a year and a half, and anytime I'd leave her with someone (even my husband) for a little while to get some peace, she'd scream. If you'd put her down, she'd scream.
My younger child is a very quiet, timid baby. We weren't sure what to do with a newborn who didn't cry. It's crazy how different she is from her sister. If we'd had her first, our other child would have horrified us. I'm grateful to have gotten them in the order that I did, because I'm only now realizing exactly how hard I had it with my first one. I probably would have entertained using my state's Safe Haven laws. (Not really, but I would have thought about it.)
Even with my near-perfectly behaved infant, I wouldn't wish her on someone who didn't want a baby. She's not as much work as her sister, but she IS work. I'm constantly having to stop whatever I'm doing to change her diaper, feed her, comfort her, rock her... and if I try to put her down without waking her up, you can bet that'll be the moment when her sister comes barreling into the room making all kinds of racket. It's a miracle if I get to shower that day. I almost never eat breakfast because between two babies I just don't have time. My house is almost never tidy. I'm always running between stopping my 2 year old from putting crackers in the dvd player and popping the pacifier back in my 3 month old's mouth.
Motherhood is a job. It might be a job you enjoy, but it's a job. A full time job without pay, vacations, lunch breaks or sick days. If you're lucky enough to have a nanny or a family member who is willing to take the baby(ies) for a few hours, great. Most people don't have that though. It's worth it for me, and I'll never say it's not. But I would also never say that it's easy or pretend that life is perfect. Not even close.