Worf is great, but why is security so bad?
Considering the technological advancements, wouldn't they have at least sensors, cameras, or microphones? Even a computer that predicted possible destructive actions from people that get onto the ship wouldnt be unexpected.
I've not seen every episode yet, but i've already seen Ferengi get on board, then openly discuss plans to fuck with the enterprise and its crew. Twice! I mean, if you're not going to spy on your own crew, at least spy on guests of the ship!