The thing I like most about this pack is how strong of an identity most maps have. Blizzard peaks, Crispy(?) Canyon, Aerial Badlands, Lava Reef (I think) all have a central mechanic they're trying out and building around.
The layouts are largely fun and accessible (which is kinda impressive considering the number of maps), combined with a lot of map gimmicks is probably why this pack has been a netgame staple for such a long time.
The one thing i'd really like to see for barkpark is more time spent on the visuals. There's a good mix of vanilla and custom texturing on the go, but the geometry is often very blocky, which on the more organic maps in particular can feel very out of place.