Can we trust IMDb ratings

Rating: 5/10 (29 January 2013)

How can this film be rated 8+. IMHO it was absolutely average. Apart from Robert Downey's sarcastic/acerbic humour the film's remaining characters were hampered by a poor plot line and an inconsistent/juvenile comic book narrative that's holed below the water line by contradictions. Marvel need to look to writers like Garth Ennis to see how comics should be done.
Costumes were embarrassingly bad; Loki's plastic horns and staff, Captain America's camp tights and Thor's spandex.
Has the IMDb score been artificially inflated, is it a case of the Emperor's new clothes, or is it Marvel fan-boys? I don't know, but it ain't worth more than 5 or 6 on the IMDb Richter scale.