I agree that the premis behind the Warlord in a high activation list is sound, except perhaps against lists that have the means to deal with it (Deathstrikes anyone?), or where the enemy has better FF like the Eldar and can deal with the massed scout formations.
It could be really fun to match your Warlord + scouts up to my 16 activation, 3K Eldar pop-corn list that took to one of the E-UK tournaments:-
350 Aspect Host (8x S. Hawks + 2x Exarchs)
250 Falcon troupe + 2 Firestorms
250 Falcon troupe + 2 Firestorms
250 Falcon troupe + 2 Firestorms
250 Falcon troupe + 2 Firestorms
175 Night Spinner troupe
175 Night Spinner troupe
175 Night Spinner troupe
175 Night Spinner troupe
150 Guardian Host + 2 H. weapons
150 Guardian Host + 2 H. weapons
150 Guardian Host + 2 H. weapons
200 Guardian Host + 2 H. W. + Support W.
100 Rangers (4)
100 Rangers (4)
100 Rangers (4)
or this 12 activation, 3K list where everything skims (except the guardians), which is a cut down version of a 4K list that I took to Britcon
400 Aspect Host (8x S. Spears + Aut + Ex)
200 Jetbikes + 1 Vyper
200 Jetbikes + 1 Vyper
200 Jetbikes + 1 Vyper
200 Jetbikes + 1 Vyper
200 Jetbikes + 1 Vyper
200 Jetbikes + 1 Vyper
350 Guardian Host + Wave S.
350 Guardian Host + Wave S.
350 Guardian Host + Wave S.
175 Night Spinner troupe
175 Night Spinner troupe
Nevertheless, I agree that Marine scouts are very usefull, and have the potential to pull some nasty surprises en-masse (like a number of other formations) which is one of the reasons why the lists are carefully checked for 'spammability', and why the Eldar jetbike armour was reduced as a direct result of the above list
