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Most of WOW's dungeons are nothing but boss fights stitched together by a bit of trash. Most have little story scripting.
STO, OTOH, has some nice multi-part story instances.
DDO has a bit of that .. but from the little i have played, there isn't as much story as in STO.
I heard some good things about the story missions of TSW. TOR has a lot of stories, but poorly executed (not instanced enough?)
What other MMORPGs have good instanced with scripted events and stories? Which one has the best stories? Best changing "world" around you?