Two thoughts that occurred to me at work this evening.
1. While I'm all for interesting and unique characters, Tanya in her current form feels like a Marvel character dropped into MKX. In a game where movement is so important, and your movement options (backdash, run) were seen to be so powerful that they were purposefully limited with a stamina system, having a character who can move with the kind of freedom that Tanya does feels out of place. I have no idea what the fix to her is, but teleports costing maybe 1/4 stamina would still allow her burst movement and the ability to complete combos.
2. Remember that she was only just released. The arguments for her power/learning to deal with her go both ways, but I think in the end, power trumps "learning to deal." What I mean here:
I think the fact that she is incredibly strong due to being a "meta breaker" right now is not going to lessen. Yes, people will learn to deal with her teleport, but due to how it currently functions and how fast the game plays, the risk/reward feels strongly in her favor. Sitting there and looking to nj2 it is all well and good, but when the game plays at breakneck speed and you're also having to watch for 5 other options, your attention resource gets spread thin.
The main thing that this makes me think of is Kabal, and what the gents would discuss on the old Kombat Tomb Podcast. Sure, people will learn to deal with Tanya. But Tanya players are also going to continue to level up. When Kabal first seemed brokenly strong, it was always "well, it's just REO." But one by one, more and more Kabal mains started showing up. Near the end, almost every top player had a pocket Kabal.
I'd rather not see a case like that allowed to develop again. And mostly, based on what I said earlier today, this game HAS to look good at Evo for the scene to grow. So many eyes will be on it. Good character and playstyle variety makes for hype matches, and is the best possible advertisement for turning casuals into event attendees.