Onimusha Warlords

Anyone played this one yet? I just bought it about a week ago and beat it. It lasted about 7 hours, which seemed disapointing. I do know that there were a few things that I missed like the holy sword or whatever and I didn't find all the glowing rocks. I have a feeling you're suppossed to want to play it again so you can find everything, but the storyline is too linear to tempt me to do that. The only thing that made me curious was the addition of an "extra" mode after beating the end boss. It still wasn't enough to get me to play the game all over again.