Well, lets just say the linked movie / documentary is rather convincing in a serious way. The radiation issues alone would make it unlikely they ever succeeded.

Did you know they made a bomb explode in space to 'pave the way' for them to pass through the Van Allen's radiation areas?

There are a whole lot more excellent arguments in that movie though.

I would have to add that they may have been to the moon, but the footage NASA showed 'live' certainly must have been fake.