Firstly, let me state that this review is (as all on Amazon should be) about the DVD release of the show, and not the show itself. The show itself was utterly brilliant. Karl; has impeccable comic timing and while you can't help but feel sorry for him at times when he's genuinely not enjoying the enviable task of visiting the seven modern wonders of the world, it is ultimately his displeasure at these trips that makes it so funny. If most of the show was him lounging around in a good mood, seeing how long he can dribble for before running out, it wouldn't be as entertaining.
The show itself gets 5/5 stars without a doubt. So then why is the DVD only rated at 3/5? They really missed a big opportunity to capitalise on the fantastic possibilities with the DVD extras. Sure the extra scenes are good, and it's nice that they included the very funny preview, but - given the quality of extras that usually appear on a DVD with Ricky Gervais' name on it - these are a big let down. The main one - and in truth, the one that could have made the difference between this being a 3 star and a 5 star review - is the surprising lack of any commentaries from Ricky, Steve and Karl. Considering their podcasting and radio history it seemed like a natural choice for a DVD extra (that, in truth, probably would have been the favourite feature for a lot of fans if executed as well as you'd expect) and would have served as an extra 6 hours of podcasts, basically. Given the wealth of stories that didn't appear on-screen (as seen in Karls' diary release), this would have been an excellent way to fill in some of those gaps, get some more whinging out of Karl and, more importantly, get a little bit more of the trio in there.
There isn't really much need for a documentary since the show itself is a documentary into Karl's travels and we saw most of the important stuff on-screen anyway. Maybe a little extra showing how the camera crew lived on this trips to contrast and compare would have been nice but wouldn't have been a deal breaker like the commentary should have been.
Overall, a fantastic series in DVD form without the extras it deserved. Still well recommended, but with a thought for what could have been,