MVC 3 Can't pass string as a View's model?

Yes you can if you are using the right overload:

return View("~/Views/Sth/Sth.cshtml" /* view name*/, 
            null /* master name */,  
            "abc" /* model */);

If you use named parameters you can skip the need to give the first parameter altogether

return View(model:"abc");

return View(viewName:"~/Views/Sth/Sth.cshtml", model:"abc");

will also serve the purpose.

You meant this View overload:

protected internal ViewResult View(string viewName, Object model)

MVC is confused by this overload:

protected internal ViewResult View(string viewName, string masterName)

Use this overload:

protected internal virtual ViewResult View(string viewName, string masterName,
                                           Object model)

This way:

return View("~/Views/Sth/Sth.cshtml", null , "abc");

By the way, you could just use this:

return View("Sth", null, "abc");

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