I lurk on these boards more so than post, but I remember when HTDAAB leaked, everyone loved it....saying what a killer album was, how it had the bite that ATYCLB didn't, how Miracle Drug was a classic, etc...
Now, everyone dumps on it.
I think it's just natural, though. When something new comes out by your favoruite band, you don't want to be dissapointed.
I gurantee four years from now, a majority of posters will be discussing how great the first single is from the next album, and how dissapointing "Get on Your Boots" was, and how U2 have returned to form.