"When you watch Gladiators, it's exactly the same as it was in the 1990s, in terms of the challenges, the music and the eliminations," Tom Harrington, an analyst at the media research firm Enders Analysis, told the BBC.
Mr Harrington said some other revived shows have failed because they've "been tinkered with" to the point they end up losing what made them good originally.
"With Gladiators, the producers understood what made it great to watch in the first place, and they've not messed with that at all," he added.
Mr Harrington said the Gladiators reboot had achieved a rare feat of getting families to come together on a Saturday night to watch TV.
"It's a declining phenomenon," he said. "Especially when you consider that younger viewers are moving away from TV to short-form video or streaming services.
"But here you have a show that's on at a particular time slot, and people [have tuned] in."