They finally bothered to animate trainers properly for the first time. I hesitate to call it an improvement since this could've been done since D/P/Pt at the latest, but there we go.
The repel dialogue, again, could've been done much earlier so all it is at this point is regrettable that it wasn't added sooner.
Grottos are nice but feel like a waste of time.
And I'm an abrasive cynic, I know. Even if I appreciate these things in themselves they are simply uncompelling. B2/W2 aren't bad, they just don't seem to have staying power with me, though that may be a problem I have with Pocket Monsters in general at this point.