I also agree with the first 2, BT is inconsistent, i hate the keyboard and i would easily switch it with my MBP 2014 one. Screen is fine for me, and it overheats so much that does not have this cold metal feel. :D

In general i can live with the all the aforementioned, but i hated the previous 2 year period with the random Wifi disconnection issues; it sometimes made my work unbearable.

Hence, i would say that the biggest issue with MBPs is the deterioration in apple software.