Once one gets past the outrageous premise and how horribly out of character it is for Bruce to deny his base mortality in this fashion, there is an enjoyable story at the heart of Batman: Future's End #1. That story - perhaps not coincidentally - exists independent of the Future's End setting and could have been told in a modern-day Batman story were the McGuffin to be changed. I speak of the scene in which Batman pits himself against Lex Luthor's security and we find that... well, the panel below says it all. Classic Luthor.
Unfortunately, this book is cursed with some of the worst artwork I've seen in a professional comic. Indeed, I had to look up the names of ACO and FCO Plascencia to find out why their artwork and their names seemed familiar. The good news is I figured it out - they were the same art team that drove me off of Constantine with their misshapen figures, poor visual storytelling and horrible coloring.
Enjoyable as it is watching Bruce and Lex match wits, it isn't worth suffering through this artwork. Nothing is. Skip this one, Bat-Fans. There's nothing of value to be found here.