NintendoWorldReport – 8.5 / 10
GameReactor – 9 / 10
VideoGamer – 6 / 10
Nintendo Life – 9 / 10
GameSpot – 6 / 10
DigitalSpy – 3 / 5

Kind of mixed early reviews. A few really liked it, but it looks like others haven't been quite as impressed.

Edit: Link- http://nintendoeverything.com/yoshis-woolly-world-reviews-roundup/

More reviews in the link