Honestly, I’m still not fully over the “new/shiny” phase, so I think that’s the main reason I like it right now.
I can see some useful things about it. Deleting messages in Mail.app is a tap on the TouchBar vs Cmd-Delete, which is a bit of a wash. Switching months in Calendar.app is quicker and easier with the TouchBar. Access to the formatting options in Word and Outlook is nice.
On the downside though, I spend a lot of time (at work) with the computer plugged into two monitors and a USB keyboard. In this situation, the TouchBar is basically useless so that really limits how much it will get integrated into regular use.