No not at all. I think although Rainbow’s my 2nd now. I’m sure you know that after Hurricane Fluttershy. Fluttershy was my 2nd for a while now. It’s not that Fluttershy’s dropped a few pegs since then. You can say Fluttershy’s my 3rd favorite (While Rarity, AJ, and Pinkie are all tied for 4th).
For me Hurricane Fluttershy was just that awesome enough of an episode on it’s own to promote Fluttershy. The only time it’s come close for me since then was Filli Vanilli, but unfortunately Pinkie’s portrayal in that episode makes it a little difficult to appreciate at least for me. But regardless, since Hurricane Fluttershy. While still being herself, she’s tamed Discord, has taken baby steps on her stage fright, shown that sometimes being too kind can be dangerous as well with the Breezies, and had a heartbreaking moment in the Finale that still speaks to me that Fluttershy has very interesting characteristics to her.
Or considering Twilight is an Alicorn. You can basically say the Winged ponies in the Main 6 are my favorites xD