I know that your get lots of positive stories and encouragement, which is great. There are many adoption success stories.
Having adopted 18 months ago and suffered Post Adoption Depression (more common than I realised when I set out on this journey) and only just starting to really bond with my adopted daughter (already had a birth child aged 5 when adopted) I recently did some soul searching and realised the following:
I had underestimated how hard it would be. We adopted having had 2 unsuccessful and traumatic rounds of IVF and didn't want to put ourselves through that again. I didn't "care" whether a child was biologically related to me or not and considered myself to be very maternal. I had no doubts whatsoever that I would love this child the same as my biological child and bond instantly.
I actually found it extremely difficult to bond with a baby who wouldn't be held, cuddled or comforted due to the trauma of losing her birth mother then foster family. It's been a hellish 18 months where I have beaten myself up every day for not being a good enough mother and mostly not liking my child (let alone the adoption process which took a year) and I realised in hindsight that adoption was far harder than going through another round or two of IVF.
I thought that whether we did IVF or adopted, that we would achieve the same end result. This has not happened YET.. And we now have the added complication of realising that our "perfect" 9 month old baby who went into foster care as a new born in fact almost certainly has Foetal Alcohol Syndrome and certainly Attachment Issues. We have just been awarded funding for Theraplay from the adoption support fund.
I wasn't naive, I did loads of research, but it's been the hardest 2.5 years of my life. I am starting to love her and don't doubt that I will one day love her the same as my biological child, but there are many uncertainties around her future. Obviously there are no guarantees for a birth child, but Foetal Alcohol Syndrome is unlikely to be an issue. We had been assured that birth mother didn't drink and "always stayed healthy during pregnancy", we now know this not to be true.
Our LA insist that one parent takes 1 year leave post placement, and looks for 4 years minimum age difference between your birth child and adoptive child (adoptive child has to be younger) but that may differ depending on authority.
Do I love her now? Yes. Would I change her? No. Would I go back and do it all again, knowing what I know now? Perhaps, but until a couple of months ago I would have given anything to undo the choice we had made to adopt.
I really hope that if you asked me again in a year I would fiercely say it's the best thing we ever did.
Sorry for the ramble but I hope that it gives you some insight into how it can be.
Good luck with your journey whichever path you decide to take