The glossy company newspaper will occasionally get the newly joined all excited about a new destination the company serves in some remote exotic place only to have them find out later that it is just a codeshare/alliance partner's destination or whatever.
In reality it propably doesn't matter as that airport will not be on the roster anyway. It can be quite a pain when travelling on an ID ticket only to find out that this particular combination of "operated by alliance partner's regional affiliate" requires a different ticked/is embargoed/has to be endorsed before departure...
I have not quite made up my mind whether the fare paying passengers really like codeshares or not.