I've been testing ShowMax for the last weeks. So while the HBO content is great to have, it's just to irritating to use.
There's no watch history. You can't mouse over to read episode synopsis, instead you're forced to open every single episode to see if you've seen it before.
And that's just the simple stuff.
You have to tie your account to specific devices(What the actual F_ck?) You can't have different profiles for different people. No recommendation engine. You can't like/favourite shows. They will probably never end up on the Roku.
So yeah. They are trying. But they still have a long, long way to go.