I really enjoyed Vagrant Story's design and storyline. Of the games I played on PSone, VS was the one I thought had the best storyline, mainly because, as someone has already mentioned, it was much more restrained, serious and not over-the-top compared to something like MGS or FF.

I liked the weapon customisation and ability to train weapons to be effective against certain monster types etc. And Lea Monde was awesome. Probably why it was such an under-rated game was because the combat system wasn't that fantastic. It didn't make it unplayable for me and there were certainly some very good battles, but it just wasn't as fun as others.