Could skate backwards faster than most people could skate forwards.
He came into the NHL as an high producing defenseman, but sacrificed his point totals to fit his teams system. For reference Scott Stevens was a perennial 60 point defenseman, but in the same system became a 25 point guy. The Devils became a defensive juggernaut post 94. For reference in 93/94 Stevens posted 78 points in 83 games, while Niedermayer posted 46 in 81. The following season in 94/95 Stevens posted 22 in 48, while Niedermayer posted 19 in 48. Both players PPG went drastically down, because how defensive oriented the Devils became.
Thats just how Lemaire's system was, he asked his defenseman to prioritize defense first, second, and offense came third. There’s no doubt in my mind that Niedermayer could have been a perennial 50 point defenseman in any other system, while being a terror defensively.
When Niedermayer was finally unleashed in Anaheim he was one of the best two was forces in the NHL. Add in his terrific post season play, IMO he was one of the best defensemen of his time, and a 100% portable player who would work in any era. You really had to watch Niedermayer to get a grip just how great he really was. There’s a reason why he won at every level, no matter what team he was on. Niedermayer was a huge reason why his teams where just great, and it’s not like he magically became great when he was 30, Niedermayer was always this good, but it wasn’t until Niedermayer was posting flashy numbers in another system people started to realize how great he was.