Have only seen the first Twilight film. Wanted to see what all the fuss was about. Not really my cup of tea but it wasn't awful imo. Would probably give it a 6/10 score. I've easily seen FAR worse over the years. I was actually much more forgiving than my wife who pretty much hated it.
Have always felt that the strong anti-Twilight internet vitriol aimed at Kristen Stewart and Robert Pattinson was very strange - they're just actors doing a paid gig.