Way too many loose ends, and Tharacia's computer was way too underdeveloped, along with Brau-1589. I was originally going to give it a 9/10, but it was demoted to an 8/10. It was still decent, though nowhere near 20th Century Boys status.
This whole manga I found to be a tad overrated. I personally think it gets too much hype since the author's made two other brilliant stories (Monster/20th Century Boys), but in reality I found I didn't really give a shit about any of the characters lol.