I'm liking it. Personally, I am not bothered by the idea of "yellow castle" as it adds color and isnt too far off base in some cases (I've been to several castles and early forts and most of them are not light gray).
I like the look, If I was a minifigure I think I could defend it from a siege. The interior is nice, as is the inclusion of a stable (I have always wondered about the lack of stables in official Lego sets). I like the buttressing, it fits nicely with the rest of the architecture. Finally, its brick-built so you cant go wrong there.