I Liked how Daryl helped out the random people on the bridge, because it was the right thing to do and then he stopped Merle from looting the car. Daryl's character has evolved the most since the start of season 1..
Yes, quite the difference between Daryl & Merle. Darryl commented "but it's a baby" (he heard the baby crying) and Merle of course didn't care.

Merle is such a jackass. Did you hear him tell Daryl (about the people on the bridge)..."they didn't even offer us an enchilada."

He is so damn unlikeable he's laughable sometimes.
TIS