Pictures can be deceiving.
The cabin looks smaller in this picture than up close.
The 189 has a good size cabin and is noticeably larger than the 139.
Okay so you can't have a game of badminton in the back as some people would expect but after the initial problematic period that will no doubt plague the 189 as in most new types this could be a good aircraft.
It's not a SK and no matter how much you slate it it will never be a SK but it's what will be doing the job for the future so get used to it.