I have to be honest and say that walking past the C area last year it didn't strike me as being the best, but you are right about D, so far out of the road. I like the E area as i've stayed there with Redcrest / Interbrava, similarly with the J area.
Actually, having walked up and round the G area last year it's a really nice pitch, lovely and quiet, but not ideal if (like us) you enjoy actually leaving the site to explore the area. F and H might just be too close to the main entertainment area for my liking, but some folk quite enjoy that