I think the trademark HBO blood & gore would have cheapened what was a powerful moment.

Yes. It was the best choice. So very effective. Also true to keeping with Arya's POV, who didn't see the actual beheading thanks to Yoren turning her head the other way. I thought the whole scene was perfect. Made me all teary-eyed.

Joffrey is one of the most loathsome fictional characters EVER.

I love Robb and I'm really pleased with his portrayal on the show.