I recall that there was a lot of unrest from the cast of Emmerdale at the time, and the entire family were written out within a year anyway.
The show itself was awful, with head judge Yvon Grace (more famous on here for the disastrous 2003 Crossroads reboot) trying to emulate Nigel Lythgoe's persona in Popstars (which Simon Cowell has done a somewhat better job of!) but it not really working.
If you're gonna do that better to do it as a fly-on-the-wall documentary.
Well, they sort of did do it as a fly-on-the-wall documentary because Soapstars, like the original Popstars, didn't have a studio element, it was all filmed on location with an anonymous narrator, it was certainly more a documentary than a light entertainment show. And it didn't really work at all, Yvon Grace was awful, but also it was so hard for the audience to get a grip on what they were supposed to be looking for. You could tell if a contender on Popstars couldn't sing, but you never knew what the judges on Soapstars were or weren't seeing and why the contestants were or weren't any good. On the ALW ones it is mostly singing.
The other interesting thing about Soapstars is that it was part of an extremely short-lived attempt in the autumn of 2001 by ITV to rebrand Mondays as a young-skewing night, so they scheduled it on Mondays alongside the RTD drama Bob and Rose and The Sketch Show, and they did trailers saying "Monday's My Day" with the idea that it would be home to classy new drama and comedy (presumably thanks to The Premiership moving some stuff that would otherwise have been on Saturday teatime). And the whole thing lasted five weeks before they panicked at Bob and Rose's ratings and parachuted Denis Norden's Laughter File in there.