I will be completely honest, almost all of the games in current Mixed Arcade are pretty much dead, with exactly 0 players playing most of them. I think it's safe to say that bringing back old Mixed Arcade system would be much better than this one.
Personally, when I didn't have my friends on, I would play Mixed Arcade because of all the random games that made everything more fun. And even with friends, or large parties, our first idea would be to play Mixed.
Now, we are limited with 5 games that pretty much ruins the whole point of the concept.
I also think Classic Cow was better since people would be able to vote and have chance to play games that were removed.