VMs don't have a mess of instance types, just standard but customizable cpu/ram with any disks and local SSDs attached. Live-migrated, billed to the second, and automatically grouped per cpu/ram increments for billing discounts.
Networking is 2gbps/core upto 16gpbs/instance with low latency and high throughput regardless of zone and doesn't need placement groups. VPCs are globally connected and can be peered and shared easily across projects so that it's maintained in one place across multiple teams. Fast global load balancing with a single IP across many protocols and immediate scaling.
Storage is fast with uncapped bandwidth and has strongly consistent listings. BigQuery, BigTable and lots of other services have "no-ops" so there's no overhead other than getting your work done. Support is also flat rate and not a ripoff percentage.
The major downsides to GCP are the lack of managed services, limited and outdated versions for what they do offer, poor documentation and broken SDKs, and dealing with the opinionated approach of their core in-house products. This usually means as a startup that you are more productive on AWS or Azure because you can get going in a few clicks with a vast ecosystem, while GCP is a better home for larger companies that have everything built and just need strong core offerings with operational simplicity.