Captain Jamie Heaslip and Eoin Reddan also got in on the 40-7 rout as Northampton Saints were left stunned at Franklin's Gardens.
Leinster are also in menacing form in the RaboDirect PRO12 - winning four of their last four - and O'Driscoll is relishing each game as it comes for his province.
"I had fun, I've yet to finish an 80 minutes this season, they're looking after the old guy," said O'Driscoll.
"I'm enjoying it, it's only my second game in blue this season, I love playing for this team.
"We scored a couple of good tries and there was a couple of big performance from the guys
"I got the man of the match which I find amusing when I see the performance of Luke Fitzgerald out there, I thought he was outstanding.
"Besides the three tries I thought the energy was fantastic and there were lots of performances like that."
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