Type in docs and element.quat was checking for a vector type.

source/blender/python/api2_2x/Metaball.c

@@ -861,7 +861,7 @@ static PyObject *Metaelem_getQuat( BPy_Metaelem * self )
 static int Metaelem_setQuat( BPy_Metaelem * self,  QuaternionObject * value )
 {
 	int i;
-	if( !VectorObject_Check( value ) )
+	if( !QuaternionObject_Check( value ) )
 		return EXPP_ReturnIntError( PyExc_TypeError,
 				"expected quat argument" );
 	

source/blender/python/api2_2x/doc/Metaball.py

@@ -37,7 +37,7 @@ Example::
             # Make a metaball
             ob_mb= Object.New('Mball')
             mb= Metaball.New()
-            mb.setWiresize(res)
+            mb.wiresize= res
 
             # Link to the Scene
             ob_mb.link(mb)