I've been working with GCP a lot during the last two years, and I think the experience is actually quite a bit better than people generally assume or adoption numbers suggest. It's probably not a great fit for large companies with really big engineering departments building really complex systems, but getting started on GCP as a small to medium org is a breeze, products at different levels of abstraction complement each other well (so it's easy to grow) and everything seems to be built to be minimum hassle and require a lot less fiddling by an engineer to get going than the corresponding AWS product. Much better web console than AWS, great K8S offering, BigQuery can do machine learning nowadays, which is actually usable for simple tasks. Everything has lots of sane defaults, it's usually only a couple of clicks to spin up pretty much any resource; in AWS this tends to be a huge pain.

Although, if you're in the EU and bound to a strict interpretation of GDPR, then your experience is going to be absolutely miserable, because there's no way to actually restrict data to stay within the EU for the vast majority of products. A lot of the serverless products has something like "data may be processed in US West or global" hidden in their docs (which legal tells me is a big no-no), and while you can set allowed regions, even BigQuery violates that silently, so that's useless and dangerous as well.

So if they were to get better at selling what they have (which they really, really suck at; we're using them not because, but in spite of, their sales efforts) and maybe discover Europe one day, then it'll be a very strong contender for AWS/Azure.