Lucas has always been iffy with characters (especially those in support of the main characters - Shortround anyone?) from time to time. I think people just have more affection for his older films because of the time that's elapsed between them first coming out and the present and as he (admittedly) has never much altered his style over the years what worked then for a lot doesn't work now.
'If the Apocalypse starts, beep me!' - Buffy Summers
'The sky's the limit.....' Jean-Luc Picard, 'All Good Things'
courtesy of Saquist