"The start is about all I am happy with," he said.
"Our discipline is nowhere near good enough.
"You can't have 34 points scored against you and think you can go deep into the finals."That sort of performance won't get the job done in the finals."
Radradra notched a first half hat-trick over 14 minutes, opening with a remarkable 80m run that appeared to beat the majority of the flat Broncos side before turning fullback Darius Boyd inside out to score.
The hulking winger saved his best until last, pinning the ears back to race 98m and notch try No.4 to bring the 29,058-strong crowd to their feet.
Centre Michael Jennings bagged a double to ensure the Eels cracked the 50 mark and snapped Brisbane's three-game winning streak.
Parramatta stunned the high flying hosts to lead 24-0 after Radradra's third try in the 20th minute and 30-10 at halftime.It was just the third time since 1999 Brisbane had conceded 30 first half points at Suncorp Stadium.
Brisbane secondrower Alex Glenn gave the hosts some chance of a fightback when he burrowed over in the 61st minute to cut the deficit to 36-22.
But the gutsy Eels weren't to be denied despite at one stage being reduced to a one man bench after the loss of Frank Pritchard (suspected shoulder), Ken Edwards (head gash) and Peni Terepo (concussion).
Parramatta backed up their 28-14 round 21 victory over Brisbane, marking the first time since 2007 the Eels have completed the regular season double against the Broncos.
"It just started the way you don't want it to start and it snowballed from there," Brisbane coach Wayne Bennett said.
"I don't think they dropped their heads.
"At certain times they did pretty good things and worked hard but then they just self destructed - it was just a bad night."
Asked if the heavy loss was a concern ahead of the NRL finals, Bennett said: "It's a concern if we carry our baggage with us".
