The 26-year-old watched as Britain beat Belgium 54-49 early on Saturday morning to set-up a fifth-place play-off with Sweden, which they also won.
Robshaw, who made his RBS 6 Nations debut earlier this year, attended fresh from Harlequins' 40-3 win over London Welsh at the Stoop the previous night.
And he was left encapsulated with the Paralympic sport, previously known as murderball.
"It was brilliant to see. You don't realise how big the hits are on TV," said Robshaw. "When you are there you can feel the sound and it echoes around the arena.
"We were saying it would be brilliant to have a go but I don't know how happy our coach would be if we did. But it looks a great game and it's very exciting to watch."
Britain's high-point scorer Aaron Phipps, who impressed Robshaw with 28 goals against Belgium, was thrilled with his attendance at Olympic Park.
"The support we've had this week has been absolutely outstanding," he said.
"We had David Cameron the other night, I saw Boris Johnson and now the England rugby captain.
"It's out of this would, it's just a shame we couldn't put a medal on the table for them."
However not everyone was happy - Phipps teammate and Welshman David Anthony admitting he would rather have seen his countryman Sam Warburton.
He said: "As a Welshman, I wish the Welsh captain was here but all the support we get is great."