I think a lot of the negative reviews came from parents who are unwilling to change their daily schedules to include their new additions into their families. Making a family shouldn't be just about scheduling time to have sex, then setting aside time 9 months later to have a baby, and going back to work once you're feeling *up-to-it* So what if you're tired? I stay at home and i'm tired too! Why wouldn't you want to cosleep if you're away from your baby all day? If you're so sick of your child you don't want to be around it at all why'd you have children in the first place??
RE: cosleeping having negative results i'll give you one, my 2 yr old couldn't fall asleep without my husband or I laying down with him. We moved him into his own bed (w/o ANY problems, no crying to sleep, no fussing about being in his room) and he falls asleep now w/o issues, we found out he started having a hard time falling asleep while we were there, but if we weren't there he'd get up and play. Now that he has his own room it's ok if he's awake for a little while reading or such, he can't make a mess. Other than that my now almost 3 yr old does everything by himself, he plays well alone, and he plays well with other children. He doesn't cling, he doesn't have troubles sleeping by himself, and he's just as emotionally stable (if not more so) than his crib slept friends. What I taught him from birth was that his needs and feelings were just as important to me as mine.
I learned to schedule time for myself around his nap and bedtimes, and with help from my husband (or friend) I found joy in knowing my son was safe because I could always see him, hear him, and feel him. And my husband loved it because working outside the home it was the only true cuddle/solo time he got with our son.
We're using it again with our newborn and it's the ONLY thing that gets us both sleep at night. I'd recommend this to anyone.