The keyboard on my 2013 MBP had too much play in the keys, and the new keyboard is better in that respect. In general, I'm not fussy about keyboards -- I usually adapt to a new one quickly. I'd recommend that you try out the new keyboard at an Apple Store and decide for yourself.
I had a fiddle around with one yesterday and compared to my 2011 Air they keyboard is far more crisp and, as you said, reliable.
On the contrary. I've only used my 15" MBP for a few days now, but three things stand out: the keyboard, the display, and the speakers. They are great.
Personally I like it a lot but I hated their chicklet keyboards so
another plus is that the laptops bottom edge no longer digs into my wrist