NO IT IS NOT!
Google does not have any vetting process, so you can upload an app with whatever functionality you want and it will be available on the play store. This can be an app that passes all user data to a random server and then that data could be sold without user consent or even apps that show pirated content.
Google can only react to issues and pull an app down from the play store once it has been flagged as an issue by people but if there’s a malicious app on the play store then you’d have already been affected by it even before google has done anything about it.
Incidentally, Google can also remove this app from your device without your consent. This can also be looked at as a plus or minus. Personally, I don’t like people having access to my devices without my consent.
Having said that, a reaction based approach means either way there’s a chance of the users getting affected by these apps even before an intervention from google.
Ps. It’s not that I don’t like Android. In fact, Android is a huge part of my daily life but I appreciate iOS and Android for different things.
There’s a reason why most mobile malware has always been developed for Android!
http://www.businessinsider.com/nearly-all-mobile-malware-in-2013-targeted-android-devices-2014-1
https://mashable.com/2013/05/22/new-mobile-malware-targets-android-phones/
Yes, I know these are old articles but I provided the links for context.