Sunny hasn't really gotten much of a role yet so waiting on her turn. Hitch is the only one so far that actually seems to have even a modicum of depth.
After that the animation is just meh. Compare Sunny's literal star-eyed fangirling when she met Discord in the comics or the low-key horror when Izzy used her toothbrush to clean her ear in TYT to her very subdued expression upon seeing ||Twilight's message||. None of that expressiveness carries over to MYM. On that same point everyone sounds too loud in MYM even though their character models look like they should be speaking softly.