For a first release, the app for the Apple TV app is adequate; however, there are issues I see after a few days of use:
Guide data loads too slowly (maybe load the text first to fill out the guide, then load the series art)
Live TV takes too long to load
Too many clicks are needed to begin watching currently airing content. I would prefer to go directly to the content and bypass the recording options screen when selecting content that is currently airing from the guide. Perhaps a click on currently airing content takes you to that content and a long press brings up a UI overlay (a la what happens when you hold down the home button when you put the Apple TV to sleep) with recording options
The scrubber does not show thumb nails unless the content being viewed has been completely recorded
The amount of time that is skipped when pressing the right side of the touch pad on the remote is too short, 30s would be better or, if in a commercial, skipping to the end of the commercial break would be best
No use of the top section of the Apple TV home screen when the Tablo app is in the top row of the home screen. It would be nice to see series or movie poster art for currently airing content on live TV.
Episodes in the series page could have a better layout. I am partial to the Hulu series layout (seasons laid out vertically, with episodes within the same season laid out horizontally). It is the quickest to navigate of the VOD services I subscribe too. Also, if I click on an episode thumbnail I would prefer it to begin playing immediately rather than have to click watch to then begin the episode. Once again, a click on the thumbnail should begin to play the episode and a long press should bring up a UI overlay with options such as delete, etc.
Additional features I'd like to see:
Show a week's worth of guide data
Make recorded content, currently airing content, and content yet to air searchable using Siri. A 24 hour guide would be sufficient if this were implemented.
Filters for recordings, sports, kids, movies, etc.
My setup is wired with a gigabit router and gigabit switch, so I do not believe the lag in guide data populating and Live TV starting is network related.