I appreciate when the pilot makes an announcement, he speaks clearly and does not "rattle off his need-to-say lines".

I also like it when his voice is actually understandable and not broken up with a clear bad connection in his microphone or a faulty PA system.

Over the years, I flew a lot of 'bush' airlines in Africa and Asia. I appreciate it when the cockpit door is open (or when there is no cockpit door), there is an awareness the passengers can see and hear all what is going on.
On one flight, i did not particularly appreciate the shouting and the "Oh ...."-sighs. (More in the short story Italians, the Art of Flying and the Laws of Probability)