Valkyria Chronicles has the highest sales for a non-Final Fantasy srpg in the Americas I believe (of course I could be wrong). It doesn't surprise me when you consider that the PS3 doesn't have many traditional jrpgs. They have Eternal Sonata and Enchanted Arms. Cross-Edge I don't know too much about it. It might be a SRPG. But either way I hear it's not good. Demon's Souls and Folklore are ARPGs. Disgaea 3 is a SRPG and has less polish/production values than Valkyria Chronicles. So what competition does Valkyria Chronicles really have on the PS3 at the present time? SO4 International, WKC (I think. It's real-time but it has a party system and you have adventuring right? So that's a traditional jrpg as opposed to a ARPG) FFXIII, Resonance of Fate, and those NIS and Gust games are all upcoming releases. Chances are if you have a PS3 right now and you have a jrpg itch, you probably will buy Valkyria Chronicles. It's a SRPG, not a jrpg but if there isn't much in the way of traditional jrpgs to play on the PS3, you'd think that you might as well right? It's that simple. in Americas, practically all the traditional jrpgs at this point are on 360, Wii, DS and PSP. So this holiday season, especially post-299 slim hype (VC sales spiked up after the slim), Valkyria Chronicles is going to be popular with jrpg fans. Unless they ask for christmas money instead to buy the jrpgs getting released in February and March.
Now The Last Remnant, apparently that game sucks. I played the PC version demo a little bit and just didn't care to learn the nuances of the battle system. I just feel like there is better stuff out there to play on both 360 and PC.