Yes, albums early in a prog band or artist's career are almost always infinetly better than later offerings, but there are exceptions, like Pink Floyd, whose first few albums before Atom Heart Mother were terrible.
And yes, I hate commercial rock.
As for the pun, that was totally unintended actually, but it is a funny coincidence.
As for which is better, I doubt Selling England by the Pound could be better than Lamb, which was awesome. Sometimes the site has pretty wierd ratings; ocassionally I really disagree with them. I'm not completely sure, but... Lamb was a masterpeice.