To be fair, I think the angle they're going for here is single volumes, not whole series. And for the instances where they pick something from a series, they're only going to pick the first volume. Essentially, when you think about it, this list is a list of recommendations. If you recommend a series, you usually recommend a first volume. For quality, Sandman: Preludes and Nocturnes can stand on it's own (although later volumes are better), as do Transmet: Back on the Streets, Fables: Legends in Exile and Ex Machina: The First Hundred Days. If I were to be brutally honest, I'd say that Preacher's first volume isn't the strongest. Plus, they may not be trying to court controversy by promoting such a controversial series next to a list that includes Batman and Superman. Sex, profanity and violence are one thing, but blasphemy REALLY pisses off some people, so I'm not sure what DC's position is these days on promoting Preacher (depends how this planned HBO series plays out, if it ever gets made).
As for the absence of DC: The New Frontier, I might point to what I said about this being a list for single volumes (since, in paperback, DC:TNF comes in two volumes), but they list LXG vol 1&2 together, and they're completely separate stories, and they list Hush vol 1&2. One would think with there being an animated movie based on DC:TNF coming out, they would show more support for it.
As for the objectionable entries, like Hush, DKSA, Birthright, Superman/Batman, well, we might not all be the biggest fans of these, but it's hard to deny that these all have some mass appeal and sold exceptionally well for DC. This makes this a list of pretty much exactly what I would expect DC to make: Some of their most acclaimed or popular volumes, all excellent tales (or at least acceptable. Despite all the criticism of a book like DKSA, much of that had to do with expectations, and there are truthfully FAR WORSE books from DC out there) and ideal stand-alone stories or jumping-on points.
