I thought the Syrio scene was great, and then he did that trip move, which moved it straight into awesome. A beautifully choreographed fight, and left me wanting for a lot more.
One nitpick: I like Arya/Syrio's similes, and I've been disappointed she hasn't said any of them.
It wasn't a
huge deal, but I didn't like the Jon/Wight scene at all. I know part of it is because the wolves are expensive and supposedly difficult to work with. Still, in the book it's frantic desperation that makes Jon throw a mass of burning curtains. It's literally all he has left - swords failed, Ghost failed, nothing is working. I don't think it was written well or directed well.
One disadvantage of compressing the rest of the book's events into these last few episodes is that you get none of the sense of scale - especially timescale - in regards to mobilising these armies. It's like Robb wakes up one day, decides to build an army, then turns up a day later at the Neck with twenty thousand soldiers.
This was my one big issue with the episode as well.
You can tell GRRM wrote this episode: a lot of awesome stuff, not a lot of cruft (such as Littlefinger monologuing). However, it's very much written like his books; that is, more as a series of vignettes rather than with the flow of a television series. Couple that with some of the possibly removed stuff regarding Arya and Sansa, and the sense of time passing is completely thrown off.