Major issues:
1. There being no default competitive mode player match
This is the biggest issue above all else. And probably the easiest to fix.
I know a lot of people think that competitive mode should be the default mode in all online game modes in I2, and that stats/abilities should have to be opted in by both players. However, I can see why NRS didn't do this. People with competitive play in mind are the minority. Most people who bought I2 will spend lots of time grinding for the most powerful gear for their favourite character, and would not be happy with this being rendered useless by something that's at the mercy of their opponent.
But there's an easy compromise. Please give us a separate competitive player match mode where we can go in and find like minded players. One and done ranked matches are not an acceptable substitute. Saying "just add people who also want to play without gear" is not an acceptable solution; you can't always rely on people on your friends list being available to play at the same time as you, that's the whole point of player match rooms.
2. The input system
Everyone is having issues here. Even with negative edge and input shortcuts turned off, it seems that the buffer window is far too big.
One example is pressing b,d,b can result in a backdash. Surely that should never happen?