*warning* Drunkenmaster-esq post upcoming *warning*
Hamilton just seems to lack motivation, plus the obvious tyre wear issues don't seem to favour his agressive driving style.
I don't buy this theory. The great drivers will adapt to whatever they're given. Brabham and Moss had to adapt to mid-engined cars. Clark and Stewart had to adapt to cars from 1.5 litre to 3.0 litre and the onset of aerodynamic downforce in F1. Pederson saw the change to slicks. Andretti the ground effect. Villeneuve and Lauda the rudimentary turbo era. Senna and Prost the move to and from driver-aids. Schumacher the lack of aids and slicks to grooved tyres.
They all adapted and won races before and after. If Hamilton can't adapt his style to a tyre which wears faster than the ones he had when he came into the sport, then he's not the driver we thought. So far, he's the modern day Gilles Villeneuve. Villeneuve, while a hero to many, was never going to be a great. He was wild, exuberant and drove with his heart firmly on his sleeve, but was reckless and seldom in a race of one. A post from years ago that's always struck me:
Nigel Roebuck used to say maybe it was merciful Villeneuve died when he did because 82 was followed by the fuel economy years when racers had to throttle back and not race to conserve fuel. Roebuck always used to say that was anathema to someone like Gilles and he probably would have quit the sport rather than do "economy runs".
The best thing which happened for Villeneuve's reputation was him dying when he did. Friends who saw them saw that Petersen had car control to better Villeneuve, but he was both faster and less reckless with it.
To me, that's where Hamilton is now. To prove he's not a Villeneuve and go from the status of past entertainer (as he doesn't do much out of the ordinary now compared to his debut year) to great racing driver he needs to adapt. If he can't, then he's just another Hulme, Hunt, Berger, Surtees, Graham and Damon Hill, Scheckter, Keke Rosberg, Jacques Villeneuve and Button.... drivers who you know were very good and won championships (except Berger, but much was thought of him in his formative F1 years), but you knew they won because the greats they were racing didn't have equal machinery.
When I saw Hamilton in 2007 I thought that 6 years down the line he'd be a multiple world champion, the guy everyone would need to beat. While he's had a car which has won races in every season he's been in F1, I can't see him being a great any more. He hasn't done enough, and for two of those years his teammate was a driver who can't even get into F1 now, and he is now being beaten by drivers who most seem to feel are only good (Button and Rosberg). I'm beginning to feel that had he moved to Red Bull last year, Vettel would have destroyed him.