He's good in the third part too. Just as good as your other units if not slightly better. Part IV is his lag time, which everyone in the Dawn Brigade has anyway.Meg gets average at best as time passes. Her gains are average overall, not particularly spectacular.
The Laguz Kings >>>>>>>>>>>>>>> everyone in your army during the endgame. Tibarn, Nailah, and Naesala are pretty rape in Part IV as well.