Yes, people still play MW3 on Wii-U. The "Offline" error here is usually a date/time mismatch.

Since Microsoft’s acquisition of Activision and the subsequent updates to Steam’s backend protocols, MW3 has suffered from frequent authentication hiccups. The "Offline" status usually means:

If MW3 refuses to load or gives you an error when your internet is down, use the following verified fixes to force the game into its local offline state. Fix 1: Use the "Go Offline" Prompt Trigger

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You cannot access the shop or use certain blueprints that require server-side verification. Summary Checklist for a Quick Fix Hard Restart: Fully power cycle your console or PC.

: Turn off your internet in the console settings or unplug the Ethernet cable before launching the game.

An outdated game client cannot connect to live servers, throwing an offline error.

If your PS5 says you are offline but your friend's list loads, the DRM license is corrupted.

: On consoles, the multiplayer is reportedly "fully explorable" in offline mode, though some bugs like missing name tags may still occur. Troubleshooting Common Offline Issues

Disconnect your PC or console from the internet (unplug the LAN or toggle Wi-Fi off). Launch the game. Wait for the connection to fail. Select "Go Offline" when the option appears.