This and Demons Souls are the best games on the PS3 bar none IMO, I'd put them above the likes of Uncharted and MGS4.
Both games are exceptional what they do, but at the same time dont follow general gaming trends which is what I think makes them both so special (and perhaps a taste of why we sometimes lose out so much in the EU, primarily getting US-styalised games rather than more inventive/bizzare/traditional japanese titles)
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Its exclusives like this that sell a console; or draw you to PC, as they offer you something that very little else does.
I finally got managed to beat the giant tank about 6 months ago and haven't played it since, as I stopped playing due to time and never got back into it, but its definately still on my list and I fully intend to finish it.
As mentioned the characterisations are decent, the story decent, its a good shot at a realtime strategy RPG and the graphics are good. Virtually everything a game should be. The little touches like a trooper named and modeled after Skies' Vyse just make it all the better.