Large Sites Taking a Hit in Google

Back around mid March, it was reported that Big sites were suffering from no title / no snippet in SERPS, was it true that big sites were being penalized? Basically, sites with lots of pages in Google were beginning to lose them.

Recently in a newer thread at WebmasterWorld a site owner reports his experience with his Amazon affiliate site, Google has lost almost 70% of his site, that is 55,000 pages.

A senior member responds with:

I've been tracking this for a while with the G Query: "bbc site:bbc.co.uk" (*)

- Oct 12, 2003: 3,100,000 pages (msg #6) - Apr 09, 2004: 1,350,000 pages (msg #5) - May 26, 2004: 660,000 pages

- so, basically, you're not the only one, and it's not something new. Not commercial either, just plain size.

Can it be that the duplicate content filter is working much harder these days?