Actually about half of this article outlines some problems the Undergrads have at TFT:
Daily Bruin Enterprise investigated complaints from UCLA film students and alumni about a lack of communication from their administrators, unfair treatment of third-year screenwriting students, and a potential violation of the Faculty Code of Conduct.
web.archive.org
It seems that the undergrad program hasn't been updated in a long time and at least one very senior faculty member doesn't think the program should exist at all.
I can't necessarily explain UCLA's high ranking, but as one of the journalists who worked on that article I have a few ideas.
TFT has its own robust publicity arm, and like all PR people I've met they tend to stick to their talking points. I've interviewed folks over there for articles I wrote at Daily Bruin in the past, and if the publications ranking film programs only ever talk to the reps from the school, that's going to result in UCLA ranking high.
On paper, TFT appears to have a long history of excellent cinema education, but the truth is that in the last several years many of the programs have fallen in quality.
FWIW, when I was interning at The Hollywood Reporter last year, one of their Executive Editors told me that even he thought UCLA's film program had begun a downward slide--and he was the guy who wrote the ranking articles.
If you have any questions re: graduate Screenwriting I can answer those more specifically, but if you'd really like to talk to a current undergrad in film I can probably make that happen too.