How to delete Content Type created through features
Open the content type (for example: article) for editing which should bring you to a URL:


  admin/structure/types/manage/article


You can then append "/delete" into the URL like so:


  admin/structure/types/manage/article/delete


Which should open a form that will let you delete the content type. I don't know if this lets you delete ones that are coming from an active features package, but it definitely does help you delete obsolete content types from inactive features packages. So be careful



FYI, if you do this for multiple content types, don't open all the delete forms in multiple tabs and try to be clever by deleting several types at once. Bad things will happen :-p Make a backup and delete one content type at a time.