2K Games has released NBA 2K14, the latest version of their popular pro basketball game for iOS devices. It's a universal app that runs natively on the iPad and iPhone.
The game features multiplayer support through Game Center, and touts multiple control schemes - "classic" and one-finger control, built for more intuitive play on mobile devices. You can play through multiple NBA seasons, and save your progress to iCloud to pick up later on another device. The game also sports a soundtrack picked by star player LeBron James.
2K Games also deserves a special nod for just making the game available for a single price and not burdening it with wallet-draining in-app purchases.