It wasn't "really good" to me, but I liked it. I would have prefered to see some storyline movement on the Others or something like that, but it still entertained me. It was nice to see Ecko again. I liked his comment about why he was marking the trees... "Cuz these are the ones I like." I just found it funny for some odd reason.
Lost has so many side stories now that they can focus on (Charlie & Claire, Libby & Hurley, Rose & Bernard), that I think we'll be seeing more of these type episodes.