Best graphics, content and physics in a bowling app: Brunswick Pro Bowling. The only area it's lacking in is online social integration, ie. OpenFeint, Plus+ etc.
The last I knew it was $.99 and besides some clothing upgrades and career mode it's nearly identical to the Wii version. In fact, I found this version to control better than the Wii version. Impressive.
AKA: rich_952000 I'm active on Twitter concerning all things iOS, PS and Nintendo; Follow me for randomness @_rIcHrAnDoM_ Love TouchArcade? Hit up their Patreon