I agree, that is the only thing that frustrates me with Gmail. I do a lot of emails back and forth with my business partners and it is really difficult to track the email the way Gmail does the grouping. They need to have a setting to show the last email first and just scroll down the list from newest to oldest.
I have used the stock email app, K9, Maildroid, etc., but they are not nearly as reliable as Gmail. Coming from a Blackberry, I have been frustrated taking sometimes up to 15-30 minutes to get an email even though it is set at the lowest setting of 1 minute or 5 minutes depending on the app. Gmail is the only one I have found that is reliable in getting emails quickly and is consistent. Am I the only one who has these issues with the stock email app?