The acquisition makes sense, in that they obviously want ratings of restaurants (and other places) on Maps, and they've already changed tactics there once or twice. This'll pretty much take care of that problem.
I start to wonder, though, whether any acquisition by Google wouldn't "make sense". Their purchase of Motorola Mobility makes sense, too (though not to everyone). When you buy a consumer electronics company and a restaurant guide in consecutive months, what won't you buy? What acquisitions won't "make sense"?
Google buys Pacific Gas and Electric for $20B. Makes sense...
If I have not seen so far it is because I stood in giant's footsteps.