the original yoshi's story had that art style because shigeru miyamoto refused to make it 3D like DKC, and now they go and do that.
not to mention the one supposed to be the 3D yoshi series is Yoshi's story ( which is part of island series in a way i guess ), iwata ignored it completely there though..
3D graphics are so easy to make and animate that nowadays i see stuff like this as just lazy,
I mean the game could have an awesome colorbook style or something, but instead it's just cheap 3d models and vaguely artsy backgrounds.
as long as it's fun it's ok I guess, so they better keep it away from TOSE and Artoon