This is one of the greatest movies of our time. The theatrical version was panned mostly for filmmaking issues (read editing) that led to all the other gripes about convoluted themes and wrongful angst, etc. Well, you'd be hard pressed to find any of those flaws in the extended version - it is very much flawless in that respect.
So, the question trickles down to what this film tells you. To me, simply put, it is one of the, if not the, most thought provoking piece ever created. That feeling of apocalyptic dread you get after reading The Watchmen for the first time or after watching the likes of Apocalypse Now or The Two Towers - this had the same profound effect. It's an unforgettable piece, excruciatingly detailed, impeccably written and worded, visualized so masterfully that you find yourselfimmersed in that fictional world, "branded" and lost in it for the rest of your life. And integral to that immersion is the realization that it is an utter musical masterpiece. Just like The Lord of the Rings, BvS is one of those films etched in memory stitched together by a truly epic soundtrack.
Not many will feel the way I've felt, but it's a feeling that most of us crave, at least those of us who have felt it before. To people like me, this movie deserves to be in the highest pedestal reserved for the grand pantheon of motion pictures.