I've also found the new 2017 MacBook w/ Touchbar keyboard to be extremely problematic. Many of the time the keys that I press don't work and I have to press them again. Tried compressed air, but to no avail :(
Meanwhile my 2012 MacBook still has a perfectly functional keyboard and has never had these sorts of issues before...
All on a brand new $3k laptop. This computer has caused me so many problems.