Soward spent two separate spells at London Broncos - in the 2013-14 season and the most recent campaign - making 16 appearances and scoring 140 points.
The Australian half-back has hung up his boots now but that hasn't stopped him from ripping into the current state of the Super League and Championship.
He claims the top two divisions are way behind the NRL, with the gap in quality highlighted in the recent Four Nations, as England lost to the men from Down Under and New Zealand.
Soward told radio station Triple M: "The Super League - and we saw it in the Four Nations - is 10 years behind the NRL, and the competition lower than the Super League is about 20 years behind.
"The Super League players just aren't good enough, to be honest. I don't know if they train hard enough. You saw in Wayne Bennett's pressers - a lot of them just aren't good enough.
"They don't play the consistent footy week in, week out against quality sides, which is what we do in the NRL."