Im sorry you feel that way, the guys in Iron Maiden loved it. I dont think Matt's a horrible singer at all, he's definitely got his moments but I wouldnt say horrible. This coming from someone whose listened to them since she was 14. Every band has it's faults.
I can relate, I've been listening to them since a little before waking the fallen was released. They still do play old stuff live, second heartbeat is without question one of the best songs they've done. I'm only disappointed to see that they've cut chapter four out of there set after they said they'd always leave it in. matt has a good voice, whether you like his tone or not, he has great range and ability.