Changing out characters is fast and can be done on the fly, meaning at higher levels the combinations of fighter/magic/healer are almost limitless.
One blemish we found while we were playing: the quest log didn't track when we had completed a quest. Combined with the fact that most quests can be vague when describing what you're supposed to do to complete them, the result was a lot of running around.
While an enjoyable and lavishly designed world, SotNW was markedly missing one aspect other MMOs enjoy: the massively multiplayer part.
The game is new, and there is not a huge player base yet. Unlike other MMOs, however, which foster a social community and create quest lines that require teaming up with other players early on, SotNW seems content to let people wander through the world at their leisure - the only conversation we've seen in-game was between the gold sellers (already!).