Surprisingly well built for an official trading card game app.

-Covers a lot of formats
-Pack opening feel relatively fair
-Seems to get into the newer sets for Standard quick enough
-Can play against CPU to test deck out
-Gives FREE good enough starter decks for all 1-2 color variations

Main flaws relate to the repetition. I'm generally not a fan of free to play "daily tasks" and making the tasks of getting cards limit to color decks gets old and feels more like a chore.

Also like others have said, when you play enough you start to see the repeition of decks that do well, especially in ranked.