Even though the writers tried very hard to make Ronan appear primitive in Runner (2005), it is clear from the video of his destroyed home world and in the episode Sateda (2006) that his world is post-industrial, therefore the scene of him eating with his fingers and not knowing how to use silverware makes no sense.
However, there is no reason to suppose that his culture uses silverware. They may choose not to. Or he may be deliberately playing the uncultured slob, to accentuate his tough guy image.
Once again, no reason not to place a heavy weapon, large heavy obstacle or vehicle directly in front of the gate and prevent surprise Wraith dart attack, or at least the dart fleeing conveniently through the Stargate.
When talking to Ronon Dex, Dr. Weir refers to Sheppard as a Major, but he had been promoted to Lieutenant Colonel a few episodes previously.