In the ones they mentioned, GCE vs EC2, GCS vs S3, and BigQuery vs Redshift, they seem pretty comparable to me.
Our lack of IAM is beyond painful. We're sorry. We're fixing it.
PD has had snapshots since Day 1; they're differential, fast and we even encourage people to use them for super-fast "rsync"!
With Lambda, its the whole ecosystem around it which makes it better than App Engine. A file changes in S3 and you want to do something? Lambda, in a few simple lines of code.
Elastic Container Service - "Why the heck is it Elastic!?" was my reaction the first time I read the term.
I realise this isn't any better :-)