I don't like that it's made by an advertising company, like the other commenter said. But more than that it's that it's wildly unpolished and inconsistent.
OEMs and carriers shove in their own apps (Samsung is especially bad about this: I don't want two apps for photos, and files, and messages, and calling, and browsing, etc etc). You can (sometimes) disable or uninstall them, but they can pop up again after updates, and I don't want to have to clean up my device just to use it.
And visually, apps look and feel radically different, all over the place. There are apps that still look like they're running on Jelly Bean, apps that use modern material designs, apps that roll their own UI, and web apps in wrappers. Every new app I have to learn how to use it. This is an occasional problem on iOS, but it's very rare compared to my experience with it on Android.
OEMs and carriers shove in their own apps (Samsung is especially bad about this: I don't want two apps for photos, and files, and messages, and calling, and browsing, etc etc). You can (sometimes) disable or uninstall them, but they can pop up again after updates, and I don't want to have to clean up my device just to use it.
And visually, apps look and feel radically different, all over the place. There are apps that still look like they're running on Jelly Bean, apps that use modern material designs, apps that roll their own UI, and web apps in wrappers. Every new app I have to learn how to use it. This is an occasional problem on iOS, but it's very rare compared to my experience with it on Android.