I actually like it when a metagame is more or less solid, because then you can build around that. There is plenty of cards that yoink the carpet for specific tactics.

I am a big fan of playing strong books, not just a book that hates out the perceived strongest build. In the priestess example given above it is sure sweet when you play against 3 warlocks in a row, but then in the finals when you meet anything else you will lose. I'd rather play something thas has a good game against many kinds of books.

My meta isnt rock solid enough yet and we are only a circle of guys and gals playing, but I cant see that there is an "ultimate win-button" book that you need to play the polar opposite of to have a good game against.