Bumping this thread with a few curent gripes.
Motivation is "`they can't fix it if you don't tell them it's broken".
(1) Logged in frequent flyer or business direct sessions time out much too quickly. It can take a long time to explore routes, dates and flights and find the best fares.
(2) Annoying chat pop-up is too frequent and there seems to be no way to opt out of it.
(3) The chat dialogue says "Hi I'm ready to chat" but that isn't true. If you click to chat you are put in a queue.
(4) If you have to restart a multi city booking after a time out, the multi city booking page doesn't render properly and there is no "search" button displayed.
(5) If you choose to modify a search it will usually default to economy and/or most flexible rather than best price.
(6) Changing one item in a search (dest, date, etc) blanks other items and forces you to reenter them.
(7) If you buy then redeem a gift voucher you're stuck with the clunky old booking interface.