NHL 08's presentation is great. The player models are cleanly modeled and feature lots of little details that really make the game feel more like real-life. This is particularly true about the animations; there are no awkward transitions and movements have a more natural feel. Though some of these little things are easy to overlook when playing (you'll spend more time concentrating on player positions and the location of the puck), little things like players repositioning their sticks or the movement of fabric makes the overall experience that much better.
Details are also evident in arenas; not only do they look great, but they sound great too. Unlike some other popular sports games, the crowd feels like it is actually into what is happening on the ice rather than just sounding like background filler. The commentators also feel like they are actually watching the game and will sometimes give reasonably good insight into your performance.