Being fair, this is a Green Lantern event that sort of spilled over into the wider DCU, so Hal being the central hero isn't particularly unreasonable.
You know, I've been thinking about this and why it bothers me so much that Hal is all Space Jesus here when that logic seems sound. Thing is, if it were a Superman crossover, or a Wonder Woman crossover, or a local Batman crossover (like if NML had eventually come down to Bruce fixing the city somehow when even the other Bats couldn't pull it off) or hell, a Captain Atom crossover, I wouldn't mind at all. But there's a big difference between those mythoi and the GL mythos - all of them have single central characters. I may love pretty much everyone else in Batman's corner of the DCU more than Batman, but I'm never going to question that Bruce is the lynchpin, you know? Kon or Steel might be awesome, but Clark is still Superman.
The Lanterns aren't like that, though, they never really have been. There was always Alan Scott even when there was only Hal on Earth-1. Kyle was The Green Lantern for years. Guy was The Green Lantern for thousands of people who only know the Corps through the Justice League. John carried the mythos for an entire television series. There is no One True Green Lantern, it's an ensemble cast, and that's always been a huge strength and its greatest appeal to me. Singling out one of them as Space Jesus simply doesn't work the way it would for a mythos that's always been centered on one person.