I waited until the show was available on All4 last night (around 7pm) and my only criticisms are the quality of the picture and the positioning of the ad breaks.
It definitely wasn't available in HD (at least, not on TalkTalk) and even the SD picture seemed to be of low quality. I've a decent broadband connection and other on demand services don't seem as bad.
Plus, the ad breaks seemed to pop up in odd places, in some cases DC and BE would be mid sentence when the ads came in. I'm assuming that this is the way C4 add in the commercials when you're watching on demand, I don't think the programmes are shown in the same way they are originally broadcast (and you can't fast forward through the ads either!)
On a side note, I thought Mark Webber was good though I get the impression he was royally brassed off after Vettel poured champagne all over him!
Overall though, not bad coverage, let's hope the live shows go well for them.