I didn't care for the new look of Mail either... so thanks! To me, it just reminded me too much of Outlook.
What on Earth are you complaining about? With Mail 5.1 aka Lion Mail, you have all of the display options that you had going back more than a decade with MacOS X 10.0 Mail. Organizing by conversation is a new option, but it takes away nothing from earlier options. This option is enabled or disabled using a single menu selection. As for the time ordering of messages, it is as it has always been. You may toggle between chronological order and reverse chronological order with a single mouse click. It has been ever thus.I have switched to classic mode, but the threads and the way that they are shown are causing me lots of problems. Mainly I miss emails that should be easily visible. I much prefer seeing them in chronological order so I don't miss any. I've also found myself unintentionally replying to an email when I mean to compose a new one. Soemone mentioned IOS; I'm fine with how threads are shown on my iPhone. Something about mail 5.0 really infuriates me. I just turned OFF "show most recent message at top," so since I show all my messages with latest at the bottom, that is at least less incongruous and counterintuitive. Looks like this will help.