It is essential IMHO, the themes, Darkseid, Batman's presumed death and etc. The FC Omni has some Batman issues, but there's like 50 issues of Morrison Batman run after Final Crisis with Batman and Robin #1-16, Return of Bruce Wayne #1-6, Batman #700-702 (some of these are oddly in the FC Omni when they don't need to be), and Batman Incorporated (Batman Incorporated #1–8, Batman Incorporated: Leviathan Strikes! #1, Batman, Incorporated Vol. 2 #0–13)
(Morrison's Batman run goes beyond just the issues in the Batman titled comic book....B&R, RoBW, Inc...all equal important parts)