i only read volume 2 (7-12)...but agree with your comparisons...i think the show has definitely improved on what was in the comics. The Dale-Andrea thing...yeah, very creepy. The show handled it much better.
As a matter of fact... i think the shows REALLY enlivens the characters. Steven Yuen, for example, does a great job of making Glenn someone to really root for...the Glenn of 7-12...not so much.
Darryl is supposed to appear soon in the ocmics (which is waaaaay ahead of the show at this point).