you mean, pasted into plain textarea, or pasted into a richtext widget? For the latter one, we switched a while ago to ckedit, which works nice and supports mobile devices. it has a paste from word, and also vice versa, an extra plugin for creating smart quotes while you are typing in the text area.
In general, tidy is still very helpful to clean up wierd input. e.g. "tidy ... -b ..." strips smart quotes and em-dashes.