Man, that's a tough call and a bold statement. It all is a matter of opinion really and a matter of when you were first introduced to Green Day. I first heard them as a senior in high school when Dookie came out and saw them live at Lollapalooza and Woodstock that summer. I was a HUGE Sex Pistols fan through high school and to me, these guys had a similar sound--quick songs, recognizable lyrics (unlike bands like Exploited or Minor Threat which screamed a lot of their lyrics) and I loved it.
I hate to admit it, but I didn't like American Idiot when I first heard it. It was 10 years after Dookie and I didn't like the long songs, the slow songs, the multiple songs in one song. It had to grow on me whereas Dookie I instantaneously loved.
American Idiot is by far one of the greatest albums of all time, no doubt, now that it's grown on me, etc., but I like the trilogy because it does have a lot of that early sound that Dookie had.
You are certainly entitled to your own opinion, and I'm sure many people will agree with you, but I really do think it depends on how you were introduced to Green Day in the first place.