Maybe they've never had the chance to bed in properly? The last sintered pads I had were crap until I got some really serious heat into them a few times
Not necessarily. Organic pads work great from cold and are quieter, but braking power falls off as they heat up. Sintered pads have much less bite from cold, they need to heat up first, but then they keep their power up to extremes and in the wet, so they also last longer. But they do howl a bit.
Maybe they've never had the chance to bed in properly? The last sintered pads I had were crap until I got some really serious heat into them a few times