I tried it last night and, well I guess MLS also has an intern monitoring the forums because they apparently pushed out an update and the screen to watch a game in progress now looks like this:
View attachment 6964
So you now pick one of two menu options instead of using different buttons.
BUT, it's broken for me at least. I can't watch any games live, or replay or condensed. Whenever I try the screen reloads like its going to start playing but just pops be back one menu level. Non-game videos available thru the app work fine. Other apps also work fine and I rebooted the Apple TV device so hopefully a fix will be released soon.