You have to be kidding about Hamilton right... Look at the last 2 races for example, His big lead over Alonso has come from just these two races, I mean he gained 36 points on him due to various reasons. Now I am not bashing the Hamster, but he has had his bread buttered on both sides all season. Stewards decisions have all gone his way, and I mean all. Also he has been picking up the scraps from others mistakes.
I think he should have been punished for weaving, racing Vettel in the pitlane, and his pole lap in Canada should have been disallowed. The only badluck he has had was the incident with Webber and his rim failure.
I have to admire him though, because he has put himself in a position to score heavily in almost every race by not making mistakes should the Red Bull's trip over each other or retire due to mechanical failures. The only race I could say he won on merit was in Canada, but even then I think Alonso gifted him that race.
All in all, I have to agree with him, Mclaren are over delivering.
Like I said, I don't think that Alonso was as lucky as Hamilton, but I don't think that there is too much difference in luck between those two.
If you look at the last two races Hamilton was very lucky. But there were quite a few races where he was far from lucky (Australia, Malaysia, Barcelona). On the other hand Alonso was also quite lucky on few occasions, so its not all white&black. Plus, very important thing is this - most Alonso 'bad luck' came from his underperforming in first place. For example:
Canada - I don't see how are his losing two places because of backmarkers seen as bad luck. It can only be seen as Hamilton/Button doing better job.
Valencia - there was nothing between Ferrari and McLaren cars there, maybe even Ferrari were faster, but Lewis managed to beat Alonso in quali and in turn that resulted in Alonso being stuck behind SC (remember that Alonso had better race-pace after Lewis had his FW problem, so in turn - if Alonso was in front he would surely be on Vettels tail thus escaping his SC bad luck).
Silverstone - there was nothing unlucky there, he had a bad start and can only blame himself for putting himself in bad position, and also not returning position to Kubica straight away (he didn't even had to ask his pit-wall, he's a smart guy).
As you can see, it was his errors that lead to 'bad luck'.
About stewards, you think Hamilton should have been punished for weaving, racing Vettel in pitlane and had pole lap disallowed. About pole lap disallowed he was fined as rules stated, so I don't see why should that lap be disallowed. Racing in pitlane is something that happens very often and more often than not drivers go unpunished so I also don't know what's all the fuss about it. Weaving to break the tow is something you may have a point, but also bear mind that rules are not clearly defined in that sense and are opened to interpretation.
All in all, Hamilton was more lucky with stewards, I agree with that. But with general track events I don't think Alonso was too unlucky.