Actually, most people who complain about Kotlin do so because they think Kotlin didn't borrow enough features from Scala. It's tough to satisfy everyone :-)

The bottom line is that if you like Scala, you are probably not going to like Kotlin and that's perfectly fine. Kotlin is for everyone else and it seems to be pretty successful with that audience so far.

I'm a fan of both actually. In my view they are targeting two different use cases. Kotlin is aiming for heavier Java interop using a smaller runtime. This is a big deal for Android. Scala on the other hand is a more independent language, with much less emphasis on interop.