He scored a try before being given a rest after 60 minutes and said making a winning return with the Lions was "a good feeling".
"It's a nice dressing room to be in at the moment - a bit different to Saturday. It was a good victory and a good performance," added the Ireland captain.
"We wanted to set out a marker and I thought everyone who took the pitch did that today.
"We probably tired a bit in the second half and the game became a bit of a damp squib, but we still scored four tries and put the knife in."
O'Driscoll injured his shoulder in Leinster's Heineken Cup final win over Leicester but declared himself "fighting fit" after the match and said he hopes to be involved against the Cheetahs on Saturday.
Roberts, who backed up his impressive display in the tour opener with a man of the match display against the Golden Lions, was described by O'Driscoll as "a big powerful man who's going to take some stopping".
The Welshman himself said "the boys are really pleased to finally click as a team and play some attractive rugby".
But he cautioned: "There's a lot to work on. We've got to play for 80 minutes and be a bit more ruthless at times out there, but our support lines and running play were world class against any team.
"All in all we're very pleased and the team that goes out on Saturday needs to raise the bar again."
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