Parcel data in and of itself are not inherently bad to have in OSM as long as they are filtered and modified before adding. For instance an open space parcel probably isn't that useful because it is not represented in OSM. It could be broken up into meadow, wood, scrub, forest, etc. Other parcel data that don't translate well include things like flood planes or highway zones. Even some forest parcels may not always translate into landuse=forest. Within cities, you have parcels that are subdivided into areas like medium family residential, multi family residential, non retail commercial, mixed use, etc. Parcel data tends to be too vague or tends to overlap other features. A better way to add it is to filter out each individual feature first, verify them and then upload them individually.
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