Just noticed that this thread exists, so I'm just gonna give my two cents on this.
I've only been on two SLC's ever: Infusion and Blue Tornado. So far they are my bottom two coasters to date, mainly because I can't say that I've really come across any other "bad" roller coasters. I mean- I've never come across a bad Pinfari or Zamperla (or any other bad Italian manufacturer to speak of), the only woodies I've ever ridden are the ones at Blackpool, and out of the two Boomerangs I've ridden, one was "relatively" recent (Al Shallal's Boomerang, 2004), and the other had vest restraints, so they weren't all bad.
I think the layout would have been great, if only during the ride you weren't completely distracted by the SLC's major obvious flaw, which is their roughness, and honestly, with the direction New Vekoma has been taking in recent years I do honestly hope they remake the SLC with the same layout with their newer track style alongside some custom-made kicka$$ layouts. I've heard good things about their latest SLC's that have been made, like Mayan and the newly retracked TGNE but I haven't been on them yet, so I can't say anything without blatantly assuming what the ride would be like without riding it.
Bottom line, I think the SLC is really great on paper, the thing is because Old Vekoma poorly executed it, it's received a boatload of hate, which I can't say is not deserved, for the most part at least.