So you are saying, green lantern and other top tiers who should win 7+ just from character select should get a free pass because Zattana is unfinished and has poor tools compared to the top 15? gotcha. Z can't keep anyone out for those same reasons, the top tiers can just go rush down and kill her.
I realize you played her 15 minutes, but you have only been playing fighting games for 2 months. grow up a bit. From here on out is just match up tech and she is low tier, aka nonviable.
Killer frost and bat girl do what she does way better due to no meter costs. However, are tons of way better characters like green lantern that should never lose to such a low tier. 6 or 7/10 means if you lose, it is due to you messing up. matches where one character should win 100% if played right, get labeled 8/10 like Jade versus Kenshi. Have fun, hopefully they nerf green lanterns long range low and grab move so the game makes sense.