I have Last Remnant on the Xbox (when it first came out). The slowdowns were resolved when Xbox released the ability to install the game to your HDD. Then they were barely noticeable.
The gameplay was interesting, I spent quite some time just running around killing stuff. It wasn't as bad a game as it's made out to be. I think it could have been better, but it was a unique tangent to the standard ATS RPG system. I never did beat it, but not because it was bad, just because I would get distracted by different things and never complete the main story.
Can't sleep, clown will eat me.