There are framerate issues when it runs on 360 (i.e. when you knock your opponent into an explosive wall, the Snow stage, the water parts of the Cave and Lost World stage, and the falling glass in the DOATEC HK stage) and Genra's armor textures don't load (but it still looks cool). It's such a shame since DOA2U runs perfectly on 360.
DOA3's visuals were years ahead of their time, most early Xbox games still looked like early PS2 games. The game still looks absolutely gorgeous in HD, it's insane how well the graphics hold against games of today. I hate how the DOA3 stages look in DOA5U, everything is just way too bright and colourful. The colour schemes in the original were more subtle and looked way more realistic.