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That newcomers are able to discern that "Decimation" is the tagline and "Son of M" is the title?

Actually, you're helping my case by saying that these titles aren't easy for newcomers to figure out. Maybe you hadn't disagreed with that assertion to start with. Anyway, I think they've not made it as easy as they could for newcomers to distinguish title from story and what's a new title and what's the continuing title, etc.