That's totally false, and that's what's frustrating about watching people play Hitman who don't grasp how it really works. You don't have to be careful at all. You can run right in front of people who are suspicious if you do it quickly enough. You can kill someone with a gun or a lethal throwable with no issues as long as you're not in a vision cone. You can outrun guards with automatic weapons and hide very easily.
Vinny poked around for 10 minutes waiting outside a room where all he had to do was throw the axe and make a run for the exit which was 10 seconds away from him. It would have been fine and all 4 of them ended up making things 10x more complicated than they needed to be. Even Jeff, who has spent the least time of all of them with the game, was arguably the most successful.
Don't get me wrong, watching these runs can be really funny. The chaos you can make in Hitman is amazing. And the fact that these guys like it so much despite their puddle-deep understanding of it makes the game even greater. Those of us who dove in headfirst and have learned everything about the game and its interactions have uncovered something amazing beyond it just being "funny," which has the side effect of making it almost physically painful to watch other people play it.
Love the Giant Bomb guys with all my heart, but I can understand the sentiment of not wanting to watch the Hitman videos. I still do, but not without wanting to tear my hair out at times, lol