NFL 2k is a one of the most realistic game for the DreamCast.  The game is pretty much a mix of hard-core football with fun arcade.  First off I would recommend getting a Mega Block Memory Card(they have around 800 blocks) `cause the game uses up 191 blocks of memory.  But you can call the your plays with out no one knowing on the VMU.  This is truly one of the funniest games I have ever played.  I would said the greatest strength of the game is the graphics.  They're not fuzzed out or miss colored in any way.  They are very solid and rich.  Game also has 1,500 motion captured moves.  The sound is amazing, it's truly is one of the best sounded games I have ever played.  The has 31 detailed courses, play editor, fantasy draft, ect.  NFL 2k does have some 2D art, but isn't to the point were it bugs to death.  I would highly recommend the game to anyone who is a football fan.