Good but not great
The iOS app version of Google Slides is still quite a bit more challenging to use than the web version. Once it catches or passes the web version, it deserves five stars for convenience.
For example, just changing the name of a presentation and moving it is an awful lot of clicks and/or searching. Not intuitive.
Other aspects of the app are pretty good, such as the text and object formatting options, and theme-consistent "suggested" formatting colors, shapes, and sizes.
VegasZephyr about
Google Slides, v1.2017.362