The leveling system is just too much, due to the fact that you can purchase blitz packs it actually turns the mode into a quite pay to win system, personally I can not see myself playing much of this mode.
The first 6 levels give significant improvements but from that it’s very very little. so a level 1 vs a level 6 would be a very tough battle for the level 1 card, but a level 6 vs a level 16 is less noticeable.
The issue is the game being new it is mostly that 1 to 6 difference, it just seems rather unfair to me, the greatest example of this is very high level nightengales or engineers, they are ridiculous.