I gave it a 3/10 .
This episode felt really horribly done after The Ashes special was so epic. The hosts aren't very good or fun (except Steve, but he's been with TGA since the begining so he should be decent by now, which he is), the car review was pointless and it just felt like they were trying to make a cheap, shitty ripoff of TG UK instead of their own thing which is now totally breaking how it felt with the first two series'.
The Lake Eyre segment felt like every TG UK challenge, but with a bit of shite injected.
The SIAU (Star In A Ute) idea was a bit too stereotypical and felt like they were trying to make it slightly different than TG UK.
I think give it back to SBS, put Warren and James (or Warren and Charlie) back as hosts and the show will probably instantly be twice as good. I'm going to keep watching as it's something fun(ish) and car-related in the TG UK off-season, and I do hope it improves, but I seriously doubt that it will.
As a sidenote, this gives me a rather bad feeling about TG USA. The TG USA guys, from what i've seen in the trailers, seem to sort of be going the same route as TGA which means it'll basically be rubbish.
I know that no show can be as good as TG UK and no hosts can be as good as James, Jeremy and Richard, but i'd really hope that when a show is in it's early days and trying to find its legs, it wouldn't be as shit as this, especially after 2 series.
Another sidenote, I recently was browsing around TG episodes and decided to watch some TGUK Series 1, 2 and 3 stuff and it was far better than this.