Let me explain. Ever since the recent patches, it's been pretty hard to find computers at Lvl 3 when playing online, even for people with high reputation that want a better challenge. Fighting lvl 1 or the the occasional lvl 2 bot is pretty boring considering the grind. Having lvl 1-2 bots also doesn't help the people who want to both play and practice their move sets against bots, as it encourages spamming unblockables which:
a) lvl 1-2 bots typically don't bother doing anything about it.
b) prevents the player from learning proper mechanics of a character.
I know these because I have been in that situation (as a new player to the game) and finding myself killing bots in the same manner over and over. If the bots are just pushovers, there isn't any incentive on creating more intricate fighting styles is what I am trying to say. When Test Your Metal first launched, it was a godsend, as it forced players (myself included) to actually learn their characters' techniques.
I personally think that players should get either one of two things:
1. Make Test Your Metal 1-3 a permanent game mode to challenge players anytime they wish, or
2. Create a separate playlist for each game mode that is lvl 3 bots only.
I would personally think this a great improvement on the gameplay and make the game more fun.