One of the dangers with masquerade (one of my favourite cards btw) is in the late game when you start risking having to pass a good card, and so in holding back on the masq you're losing the +2 cards and hold a dead card too. I think this card also plays a little differently if everyone is getting it, not just yourself - often I'm the only one, and it performs amazingly, but if everyone has a go it's just not the same.
Regarding bureaucrat, friend of mine trounced me with this recently, or at least he attributed it to that. I was sceptical, hence the reason for me reading this thread. Personally my favourite use for this card is as an attack to put on the table with new players because it isn't too much of a ball-buster like Witch or something which can put people off sometimes. Bureaucrat has more strength in a game with mixed VP cards though (Great Halls, Nobles etc) which I don't think has been mentioned yet.
I think I'm going to give it a go a bit more.
(Though whoever above said 2xCourtyard BMU - that sounds awesome, need to try that first!)