I think it was a bunch of little things that just added up.
I will say, to note something positive, that we were upgraded from a standard view to a lagoon view (same thing happened to us at YC), so that was cool!
But, I will say that BC is very much in need of refurb, which is obviously starting so that's great. We found the furniture to be very dinged up. DH opened the closet door upon arrival, and it fell off.

. He fixed it. There was a huge gauge taken out of the wall near the sliders....cosmetic, but unsightly.
Mousekeeping was pretty good in the room, but we saw that people would put their dishes outside of their rooms and it would stay there...for days....
Obviously the CL lounge is in a temporary location, and it was very small. It did have a great view of the Boardwalk, but small. Again, the offerings weren't great...lots of fried items....I think we have decided that the extra expense of CL is no longer worth it to us....which is good for our checking account.
I loathe that the buses pick up at YC first. They were nearly almost always full by the time they got to BC. Thank God there are still some kind people out there who gave up their seats when they saw my bulging belly, but the rest of my family usually had to stand.
Also, and this is a personal thing, and not at all related to pregnancy, because I felt this way last time, but I hate the smell of the Marketplace. I don't know what it is, but yuck! And every time we got on or off the elevator, there it was.
Lastly, the lobby is always a cluster. YC was so much more serene.
I don't know...we LOVE the proximity to Epcot and DHS, but we would chose YC over BC any day (like the YC theming more too). I just don't think we'd chose BC again. Glad we tried it and get to check it off of our list.