Loved all (but one) of his scenes.

Also enjoyed:
Margaery Tyrell, pragmatist in a low-cut dress - That is one savvy woman.
Arya Stark and Tywin Lannister - Completely unrealistic but a treat to watch these 2 interact.

Theon's inner tumoil (lol), Robb's "love story" and that horrid Ros were a gigantic waste of time.

More Jaime can never be a bad thing, also nice to see what makes Margaery tick, Arya & Tywin and I'm glad they got rid of those horrid Frey boys.
Theon can shove his inner turmoil where the sun don't shine, and Robb's love story with Talisa has made me lose a LOT of the respect I had for his character.
Have no real opinion either way about the rest.

There wasn't one scene between Arya and Tywin I didn't enjoy. Actually, I was kinda bummed when Tywin left Harrenhal because it meant they wouldn't have any more scenes together.

Also, Theon's inner turmoil. I haven't read the books, so I can't say how he's portrayed there, but the show did a good job with the character, I think. Yes, Theon is a dumb, despicable douchebag, and yet, despite all the awful things he's done, I still feel somewhat bad for him.

Not really any, but this the most. Maybe Arya and Tywin 2nd but I think their scenes are overrated.

I like pretty much anything having to do with Theon, even when it's destroying me. >.< The Arya & Tywin scenes were interesting (and occasionally, panic-inducing), and Jaime being a bitch is always fun to watch. =P

I don't know what went on in the books with Robb and whatshername, but... *eyeroll* Girl with a sob story shows up, spews moral crap all over the place and marries a main character in 4 episodes? Smells like bad fanfiction.

I miss the Walders! They are a symbol of where the Frey's allegiance lie.

Jaime's storyline is basically the same story, just taken from the start of A Storm of Swords.

The worst changes was ignoring that Roose Bolton seized Harrenhol with Arya's help

!