There is some evidence to back up some of his claims, though. Of his last five races, only one has really been impressive. I think that it may be a combination of an inexperienced team and also the development freeze on the McLaren due to the spying business from last year. That may also account for some of BMW Sauber's gain on them.
I'll make my own judgement at the end of the season, but I'm expecting Heikki to out-perform Lewis this season. If it wasn't for him being unlucky with the safety car in Australia, he'd be leading the WDC at the moment.
I'd like to point out that I do not think Lewis is a bad driver. He is great, but I don't think he is as great as the media would have us believe.
I agree with that. Hamilton, whilst I think he is clearly very gifted, has some obvious flaws which have been swept under the carpet by the media, especially in Britain. His inexperience has shown at times, as has the fact he can make mistakes like any other driver. (A completely separate issue is his personality, which is and isn't linked to racing. He like to show himself and the media like to show him as some humble little lad, but a few things indicate to me that he will do what it takes to win and can behave inappropriately like others. Some of this was definitely involved in last year's bust-up with Alonso, his possible rant at Ron Dennis - the guy who paid for his career - and his remarks after the Monaco Grand Prix last season, for instance.)
I also feel McLaren have been hindered slightly by being 50 million quid down on what they thought they would be, not allowed to develop several areas of the car, which they had probably done a lot of work on themselves before Ferrari's knowledge came in Coughlan's direction anyway, and Hamilton and Kovalainen don't inspire me with confidence as test drivers (but that will come in time - but probably not in time for the 2008 and 2009 seasons).

Ayrton Senna: WDC 1988,
1989, 1990, 1991
McLaren: WCC 1974, 1984, 1985, 1988, 1989, 1990, 1991, 1998,
1999, 2007McLaren: WDC 1974, 1976, 1984, 1985, 1986, 1988, 1989, 1990, 1991, 1998, 1999, 2008