The best introduction to Alan Moore's inventiveness - bar none.
From the fully-realised humourous story of the science fiction poem 'Lobelia Cloam' to the man who lived life backwards to the school for super-villains, there is something for everyone here. Something, but in fact, quite a lot, if like me you have been hooked on comics and science fiction throughout adulthood.
As an example of a classic story uniquely realised, see the 'idea as contagion' storyline - a great theme exquisitely topped off by the twist at the end of the tale. If this were personalised it would be a great storyline for movie or book.
'Lobelia Cloam' shows the same mastery. Be thinking 'Hitchhikers Guide to the Galaxy', as a poem. The closest example I can think of is John Cooper Clarke's 'I Married a Monster from Outer Space' (with that all-time great put-down, when C-C observes the small-minded onlooker: "It's bad enough with another race - but fook me! a monster from outer space!")
School for Supervillains is a similarly well-executed nice idea. You've got to wonder about where those endless lackey's come from that are the essential cannon-fodder at the villain's island fortress. Well, here's the recruitment advertisement for them: good pay; excellent prospects; must have own insurance.
The most subversive story is the Man who Lives his Life Backwards. Again, another blockbuster theme explored simply and economically to leave an indelible memory. The theme is explored elsewhere by eg Harlan Ellison as thriller but not as here. It is difficult to see this story working as well in anything other than the graphic medium.
The only disappointment is the book cover. What on earth were they thinking with a (cheap) detective inference? For my money, this collection beats Watchmen and Swamp Thing and V - the last thing it needs is unederrating...