Enjoyed the show as ever, but they do seem to jump the gun in nearly every episode. Wasn't surprised when the cairns turned out to be 'modern', and a lot of the time 'speculation' is presented as fact, which can get a little trying. Also the whole 'post hole' hypothesis is stretching it for me.
How many pieces of timber stuck in open ground without eventually being covered by peat or some other anaerobic substrate do you know that last a century or more let alone 2-4000 years. I've inadvertently been photographing a fallen tree that turns up on one of my walks through a local nature reserve for the last 10 or so years. Parts of that are nearly dust/dirt in that little time. Give it another 20 or so and there will be no evidence (other than the small earth mound around it's roots) that it was ever there.
Despite all that, and my inevitable rant at the tele when it's on, i do enjoy Time Team (honest!) being one of the few archaeology progs still on. Mind you, being a bit of an oldie, i do mourn the loss of progs like Chronicle, where they covered all sorts of great digs, sites and finds from around the globe.