I HATE the new web interface. It's significantly slower, shows less useful information, and has many more times where it just doesn't work as compared to the old web interface. If there was an option to go back to using the old web interface fully, I would sign up for that immediately.

For an example of a thing I hate about the new web interface is trying to buy a stock. You end up in some different part of the website where after you place your order it shows you a differently formatted order status page than the normal order status page. There's an Exit button at the top. Pressing the Exit button will pop up asking if you want to leave because you'll lose all your unplaced orders, of which you have none because how you got to the Order Status page was by fully placing an order. It's confusing for no reason.