I recently watched Temple, Raiders and LC , in that order, with my 7 year old nephew while he was staying with us for the weekend. It was the first time he'd seen any of them. He was a bit uncomfortable during TOD, found it a bit scary. He was gripped by Raiders though. He stayed with it every step of the way, (which I think says a lot about just how beautifully balanced Raiders is as a film in terms of its pacing). Interestingly however when we watched LC, which I thought would be his favourite, he was a bit distracted from the meeting with Donovan to boat chase. I think he found it a bit talky, although he was fine after we reached the 'no ticket' scene.
Next day though, he wanted to go outside and play Raiders. Specifically.
So I disagree. Raiders would, and does, hold up today.