Does Madden NFL 12 on Wii Have Superstar Mode? No

No. Madden NFL 12 on Wii does not include Superstar Mode. That mode was exclusive to the Xbox 360 and PlayStation 3 versions (introduced in Madden 10).

Wii Version Features Instead

EA tailored the Wii release for casual/party play with motion controls:

• Franchise Mode: Full 32-team management, drafting, trading, and season simulation.
• Challenge Mode: Scenario-based objectives (e.g., "Down by 4, 2 mins left").
• Mini-Games: "Quarterback Challenge," "Field Goal Frenzy," "Running Back Gauntlet" using Wii Remote gestures.
• Online Play: Head-to-head via Nintendo Wi-Fi Connection (now defunct).

Why the Difference?

The Wii's hardware couldn't support the same animation/physics engine as HD consoles. EA built a distinct codebase ("EA Sports Wii Engine") focused on accessibility over simulation depth.

For a career-style mode on Nintendo hardware, you would need Madden NFL 13 on Wii U (which brought back "Connected Careers") or play on Xbox/PlayStation.