1. The price - Personally I don't think it is justified to essentially bump the "actual" MBP (meaning touchbar and 29w processor) by $500 for what we get. The original retina 13" were similar price wise at release, but the display was a massive upgrade. The touchbar not so much.
2. No kaby lake - this is an intel release timing issue, if you want Kaby Lake wait a few more months.
3. Questionable utility of the touchbar - I own one and it is useful for anything with linear editing...so audio or video. Otherwise I just use it for media functions just like I would with physical keys (I don't use the function keys.) It could be more useful in the future given more software support.
4. Dongles - This is another temporary problem until devices are all USB-C.
5. No magsafe - Sad, but there is one advantage in that you can now do power/display/connectivity all over one port...and I can't go back from that. I have an LG 4k monitor with USB-C so I just plug in one cable and get my 4k display, mechanical keyboard, and speakers just from that. And I can rearrange my desk to put my laptop on either side of the screen. For me I'm either plugged in at my desk or wireless elsewhere, so tripping over a cable was never really an issue for me once we hit the 5+ hour battery mark.
6. The keyboard - I love it, and switch off from my Whitefox with Cherry mx blues on my desk. Most mobile keyboards feel squishy to me but the new switches they are using give a lot of stability and a pretty solid click as well, even though they have such little travel.