They WISH it had been 50% plus, it was in fact more like TWENTY percent more than the energy pumped in. The surprise for me was the fact that inertial fusion was the winner of the drive to produce more energy than it took to blast that little capsule.
But now there is a growing list of projects that now looks more like engineering issues rather than fundamental physics which is what took decades and decades to figure out.
It might even be the smaller Stellarator or some variation that may finally see more energy generated than consumed but it is still up in the air if it is even possible to make a Tokamak or some such into a commercial power source since they have a long way to go even after going say ten to one as to input V output, the deterioration of the guts are going to be very expensive to replace every month or so when the walls are saturated with ions and radiation and the resultant weakening of the metal in the walls.
My guess is magnetic fusion won't be commercial until MUCH higher strength magnets are developed, maybe a MEGAgauss level or some such.
AND near instantaneous control of the turbulence sucking out the energy created.
When I was 18 and in Palomar College near San Diego, I first heard about Tokamaks and such and it seemed to me then it was a matter of VERY fast feedback networks to control those instabilities and it turns out I was right.