yeah, and? the harder maps show up earlier on when you don't have your really good units yet. not saying the later maps are easy, but when you get your full team set up things calm down a little. that's why erk is so highly rated in HHM despite not being used in the end game. he's got a solid 10 chapters of being your best and probably only mage. lyn's ability to dominate early on with her manni katti makes her a lot better than she normally would be.
Erk's actually not that good and Lucius beats him for promotion because of C Staves and better offensive growths. And Lyn's Mani Katti abuse doesn't last forever.
Yuri/Shoujo-Ai is the purest love. No questions asked. Oh Poor soul who has lost their love, I will make your heart race once more!
legit question, she has good stats (I've always liked speedy characters)
Just because you like high speed does not make her stats good. A base HP of 16 with 2 Def/20% growth is not a good thing. She consistently dies in two to three hits, and her Avoid isn't as great as so many people exaggerate it to be.