As for what makes him so good - he probably has gelled with the VW just perfectly. A bit like Vettel/Red Bull combo in their heyday. Or pick any comparison you'd like. Team-mate Solberg is already nearing 45 and isn't at his peak any more. He is still competitive and motivated, but just lacks that extra tenth these days. Peugeot and Audi are quick, often seemingly in the same ballpark as VW, but small things often go wrong for them, so there you go.
They've worked with the VW car, and made it work more in the way Kristofferson likes, and P.Solberg have tried to adapt to that (you can see the huge difference from how Solberg used to run his Citroën in regards to setup). However, the biggest problem for Solberg without doubt, is his illness. Granted, he's better now, but at his worst, he drove the heats and the rest of the time he was spending in the bus, sleeping. That's not the perfect energy level for any kind of motorsport. In addition he suddenly had to start using glasses due to "cloudy vision". You could also see this in Latvia, he started out without glasses, but put on glasses after a while.
With the best and most professionally prepared car, suiting perfectly to his driving style, and being a very handy driver, it's no wonder why Kristofferson is dominating.
He's different class - I wonder if he has any ambitions in a higher profile circuit series? He's quick in a VW TCR car as well....
Who knows, former STCC winner in the S2000-era(2012), might do it again in TCR era now. Also a former winner of the International Superstars series in Italy, the same year he won STCC, the same year he also won the Scandinavian Porsche Carrera Cup. So that's three championships in three drastically different series the same year.
I know World RX is completely different to WRC but it would be interesting if he had a go at WRC for a few rounds next year.
He is underrated in the world of motorsport. Many won't have heard of him.
If Kristofferson had entered in to WRC2 in Sweden this year, he'd taken points, with a 6th in WRC2. However, he was quite a bit behind the top 5. I guess his best rally result was 2nd in a Norwegian championship rally. A few seconds behind Anders Grøndal, so it's clear that he does have some potential, as even though Grøndal is over the top, it's a nice result for someone who have done 10-ish rallies in his career.
It's also worth noting that Kristofferson is a part of EVEN Management, together with Andreas Mikkelsen, Esapekka Lappi, Pontus Tidemand and Ole Christian Veiby.
Let's spread the WRX love to the masses. This series is just growing exponentially, it's amazing. 
Good on him though. 
