"IMDb content is user-submitted and often subject to incorrect speculation and rumor. The use of the IMDb on Wikipedia for referencing is considered unacceptable and strongly discouraged."Wikipedia:WikiProject Film/Resources
"...self-published media...are largely not acceptable. This includes any website whose content is largely user-generated, including the Internet Movie Database (IMDB)..."WP:USERG
As I've said, this is a long-standing consensus. If you disagree, I encourage you to take it up at Wikipedia:Reliable_sources/Noticeboard. -