It isn't as much fun, but the imagery of the places I care about is better than google, in some case dramatically better.
Their place data needs a lot of help. e.g. If you look for the nearest hospital from me it will take you to a new retirement community built on the site of an old hospital. It is easy to report the problem, now to see how long until it is fixed.
Yeah, it seems to really vary. In my short time of playing around, I haven't noticed much reduction in quality at all around my city (Brisbane, Australia) over Google Maps.
The only thing I noticed so far was that St. Lucia Golf Course was incorrectly labelled as Indooroopilly Golf Course (which is a few kilometres away). I reported it.
I'm actually fairly impressed with the number of businesses from Yelp - I wasn't aware that it was available in Australia, but it has all of even the most obscure little cafes and shops I've searched for around town.
Their place data needs a lot of help. e.g. If you look for the nearest hospital from me it will take you to a new retirement community built on the site of an old hospital. It is easy to report the problem, now to see how long until it is fixed.