The problem with Nariko isn't that she builds meter slow. In fact her core moveset is one of the most versatile in the game.
The problem is she can't reliably kill in 1 vs 1 without overrelying on her level 3.
1v1 isn't the main game mode but it is something to consider. I don't find her to be the best character, but I think she is solid.
Many characters either have good level 1's and bad 2's and 3's. Or solid level 2's and 3's but bad level 1's. She has a setup to her level 2, and her meter build lets her build a level 3 fast.
I look at characters overall in all modes though. 1v1 has problems like FFA does. 2v2 at least makes characters viable without being a pure mess. But the characters were made with all of these modes in consideration.
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