There are so many things it's tough to know where to start.

1. Roping is out of control. Get roped constantly when opponent has to mulligan or the game isn't going their way.
2. Algorithm is terrible. Why do we have to play the same 3 decks constantly?
3. Randomness of shuffler is unrealistic at best.
4. Lands? It's either too many or none.

I personally believe there is coding to benefit some over others. Say people that spend lots of money over those that don't. I have actually been taking notes with a friend. Two different accounts playing the exact same decks. One account gets all the problems listed above 9 out of 10 games. The other gets perfect draws, curve and a better variety of opponents 9 out of 10 times. It's quite baffling and embarrassing for Wizards to look at the data. Anyways, we all know nothing will ever get done as long as players keep spending. Just wanted to feel better by getting my frustration out there.