The end result of a search engine is only copies of other people's work -- copies of millions of other people's work, in fact.
But some other people's work is generally dependable (both Google and now MSN are using ODP's work as their research must presumably show it adds some value) while others' is highly suspect (all that work needed to weed spam, and mirrors, and hidden text, and cloaked pages, etc etc).
The ODP's 4.5+ million listings is a beacon of sanity compared to the morass that MSNbot and others have to traverse.
The answer is not for MSN to stop using the ODP because the ODP is not perfect: it's for webmasters en masse to work to improve that swamp so MSN doesn't need to use the ODP.
Don't blame MSN or the ODP for the failings of a whole industry. Instead, work to get it fixed. This is the Internet, things are meant to work at wapr speed: so it surely shouldn't take more than six months, max.