A common problem which other users have been complaining about is the keyboard autocapitalising every letter in chat, unless they uncapitalise each letter themselves, meaning chat is full of caps-spam.
Another problem is that some users, me included (on my Nexus 6P, which may not be a tablet, but has a huge screen), enter their message in the little 'message' box which pops up, but can't hit submit while the box is open, pressing enter on the virtual keyboard starts a new line, and the back button gets rid of the message box and the message with it, meaning they can't chat.
Screenshot: https://goo.gl/photos/drFKqV9gZ9PxABxF6
Even for tablets, I believe that the user interface requires an overhaul.
I'll pull out my tablet in half an hour and see if the game is easier to play on it.
One final gripe, game doesn't utilise the full width of screen, causing black bars to appear.
I think that we can get Android smoothed out over the next few months. =D