I agree that there are only a few games that stand out, I include among these Angry Birds, Homerun Battle 3D and a number of Flight/Driving Sims. However anyone without a smartphone should not feel left out, or that they are in any way missing something. There are far better games available online and often for free, that easily match or exceed the titles available on smartphones so far.
I believe that smartphones are the future of gaming, when powerful enough, but still a long way away from being a match for any game console with all its current add-ons. I have however seen a demo of Quake on Android and the potential for some great titles is there.
I've put up a few reviews of my top three titles, for any Smartphone users.