His rant is great, for more than just scala.
The link that works for me on a desktop browser: https://www.youtube.com/watch?v=4jh94gowim0
Wow, this is a brutal talk.
In case others are curious as to content: For me the major takeaway was that the person who has written more core Scala code than anybody thinks that the collections and probably the whole language is irredeemably fucked. He had example after example where if you do a reasonable action in 2 different ways, you get 2 different results, and that it was impossible to know why without an incredibly deep understanding of the implementation details.
This makes me sad, as I really like a fair bit of what Scala does. But the video makes a persuasive case that Odersky, et al, bit off more than could be chewed, throwing in too many interesting ideas without really thinking through what happens when those ideas intersect and combine.