Cons: flimsy accessories, arrived with some broken pieces
Let me start by admitting that I bought the Ultimate Dream Castle despite all of the horrible reviews on this site as well as others. My daughter asked Santa for this castle and was convinced that Santa was going to bring it and I didn't have the heart to shatter her 5 year old dreams. It is now the day after Christmas and this review is based on my assembly experience as well as the 4 plus hours of play it has gotten so far. While our experience has been pretty good, I still think it is only average quality based on my rather extensive experience with other similar toys. Compared to other products from Mattel (the Imaginext toys in particular), this castle seems less durable and encourages less imaginative play. Also, a lot of toys now come with their accessories fully assembled and this product would be significantly improved by better designed pre-assembled accessories.
Assembly/Quality: Assembly was very easy - took about a half hour. All of the pieces of the castle fit together nicely and feel solid once attached as long as you pushed until they "clicked" in place - this includes the frig that others noted didn't fit. One exception: On the main castle the hinge of the door to the castle is supposed to fit in between two recessed points and the plastic on one of recessed points on our castle doesn't go all the way down so the door just hangs off the hinges. I'm trying to figure out a fix and/or call Mattel because returning it is not an option. The quality of the accessories was somewhat better than others have noted - our bed pretty easily fits into the bedroom on an angle (the fit being a problem I remember from the barbie dream houses of my youth) but falls off the edge if the castle is jostled (the closet also doesn't fit well into place and falls down as well). Neither of these things bother my daughter. Of the rest of the accessories, the table in Tiana's cafe and the towel rack wouldn't stay together, but both of those were fixed with a little super glue. Also, the accessory that attaches to the staircase is very wobbly so I just left it off - the princesses can just walk down the stairs, I'm not even sure why this was included.
Play value: As noted above, my daugher played with her castle for almost 4 hours on Christmas day and first thing when she got up this morning. Our dolls all fit in the chairs and can use the magic carpet.
Durability: While the castle doesn't feel as solid as the Imaginext buildings that I know and LOVE for my boys (wish they made toys like those for girls), it has held up well so far. Other than some furniture falling over it has already survived being moved twice up and down stairs, three royal balls and being attacked by Angry Birds as well as a large dragon and ogre.