The (Uncanny) X-Men by Chris Claremont, John Byrne and Terry Austin. THIS IS IT! The still-unsurpassed mold for the modern superhero team. No matter what the opinion makers might tell you, this is THE ONE every single creative team has been trying to mimick, beat down or surpass ever since it was first done. This is the one that jumpstarted the whole X-Men franchise into the moneymaker it became later on. This is the one that gave us the Wolverine we all love and hate and love to hate.
This one has it all: gorgeous artwork, memorable characters, action, grandeur, tragedy, humor, romance, friendship, betrayal, star wars, a secret society, brainswashing, the-end-of-the-world-as-we-know-it, an apocalyptic future, time travel, battling superteams, dinnossaurs, giant robots, shapeshifters, cyborgs, aliens, mutants, a demon... everything and the kitchen sink. A perfect recipe for failure, right? Yet, it works. And it works beautifully!