I've played through Deus Ex recently (which uses the Unreal engine), and also the first single player Unreal title. Next time you do, have a look at the textures closely. They still look impressive imo when you consider how old the games are. It reminds me of a grainy effect when looking at other titles which seem somewhat similar, like Painkiller. When I play titles using the U3 engine, there are times when I do think 'Yuk!'. Quite a lack of definition.
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